CN1964221A - Orthogonal frequency division multiplexing access system and method for wireless relay communication - Google Patents

Abstract

The invention relates to a wireless transfer communication orthogonal frequency division multiplexing access system and a method. The system of the invention comprises a BS (base station), an RS (relay station) and a user terminal, and the method mainly comprises the following steps: a downlink transfer zone and an uplink transfer zone are respectively arranged in a downlink subframe and an uplink subframe of a BS physical layer frame structure in a time division multiplexing TDM mode, the downlink transfer zone is arranged in the uplink subframe of a physical layer frame structure of an FDD wireless receiver of an RS and is used for defining a relay channel and an OFDMA symbol combination of the downlink transfer zone of the RS receiving BS, and the uplink transfer zone is arranged in the downlink subframe of the physical layer frame structure of the FDD wireless transmitter of the RS and is used for defining a relay channel and an OFDMA symbol combination of the uplink transfer zone of the RS receiving BS; and performing wireless relay communication between the BS, the RS and the user terminal by adopting an FDD mode based on the set uplink and downlink physical layer frames of the BS and the RS. The invention can realize relay communication of RS based on single FDD wireless transceiver in communication system, effectively ensure relay communication between RS and BS, user terminal, and effectively avoid various possible interferences.

Description

Orthogonal frequency division multiplexing access system and method for wireless relay communication

technical field

The invention relates to the technical field of wireless communication, in particular to a wireless relay communication orthogonal frequency division multiplexing access system and method.

Background technique

IEEE 802.16 is the first broadband wireless access standard, which mainly includes two versions: one is the broadband fixed wireless access version 802.16-2004 of the 802.16 standard, and the other is the broadband mobile wireless access version 802.16e of the 802.16 standard. Only two network elements are defined in the 802.16-2004 standard, specifically BS (base station) and SS (subscriber station); in the 802.16e standard, only two network elements are also defined, specifically BS and MS (mobile subscriber station). stand).

At present, 802.16 Multihop Relay SG (802.16 Multihop Relay Research Group) only proposed the concept of RS (Relay Station) of WiMAX (Global Interoperability of Microwave Access). The relay communication entity of the BS, thereby expanding the coverage of the BS or increasing the throughput of the user station.

In addition, at present, in communication systems, such as 802.16 systems, OFDM (Orthogonal Frequency Division Multiplexing) or OFDMA (Orthogonal Frequency Division Multiplexing Access) technology is usually used for communication. In a channel (Channel) of an OFDM or OFDMA system, its OFDM or OFDMA symbol is composed of subcarriers (Subcarrier), and the number of subcarriers determines the number of FFT transformation points. Subcarriers constituting a subchannel (Subchannel) may or may not be adjacent, and FIG. 1 shows an example of adjacent subcarriers.

In a communication system, subcarriers can be divided into the following types according to the type of data transmitted:

1. Data subcarriers: subcarriers used to transmit data;

2. Pilot subcarrier: subcarrier used for pilot frequency;

3. Empty subcarriers: subcarriers that are not used to transmit any number, including guard bands (Guard Band) and DC subcarriers (DC Subcarrier).

In an OFDM or OFDMA system, different users divide the uplink FFT (Fast Fourier Transform) space, and each user transmits on one or more sub-channels. The division of sub-channels is an FDMA method. All effective sub-carriers are divided into several sub-carrier sets, and each sub-carrier set is called a sub-channel (subchannel).

In the process of dividing sub-channels, the following three methods are mainly used:

The first is to divide the carrier into continuous groups, which is the simplest to implement, and the interference of adjacent sub-channels is small, but the obtained frequency diversity effect is poor.

The second is that carriers of different sub-channels are interleaved in a regular manner. This frequency diversity effect is better, but the system is more sensitive to inter-sub-channel interference.

The third is an improvement on the second, that is, carriers of different sub-channels are interleaved in a pseudo-random manner, and different base stations use different sequence change codes to reduce interference between base stations.

In the 802.16 standard, for the licensed frequency band, the duplex mode can be FDD (Frequency Division Duplex) and TDD (Time Division Duplex), and the SS (Subscriber Station) of the FDD mode can be half-duplex FDD. As for the license-free frequency band, the duplex mode can only be TDD. As for the license-free frequency band, the duplex mode can only be TDD. The 802.16 OFDMA (or SOFDMA) frame structure under FDD is shown in Figure 2. In 802.16 OFDMA (or SOFDMA) mode, PHYburst (burst) in OFDMA (or SOFDMA) is assigned a group of adjacent subchannels and a group of OFDMA symbols.

Data transmitted on a physical channel is transmitted in frame format. Each frame includes DL (downlink subframe) and UL (uplink subframe). In the FDD mode, the downlink subframe and the uplink subframe use different frequencies for transmission, as shown in Figure 2, the DL uses frequency f1, and the UL uses frequency f2.

A burst can be assigned to an SS/MS (or a group of users) in the uplink, and can be sent to the SS/MS by the BS as a sending unit in the downlink. The initial access ranging Ranging, periodic ranging Ranging, and bandwidth request of the uplink SS are all performed through the Ranging subchannel. The downlink subframe starts with a preamble for physical synchronization; followed by FCH, which is used to specify the profile and length of one or more downlink Bursts following the FCH. Then there are DL-MAP and UL-MAP messages. DL-MAP is used to indicate the subchannel and OFDMA symbol position and usage method (profile) of each downlink burst, and UL-MAP is used to indicate the subchannel and OFDMA symbol position of each uplink burst. And usage method (profile).

The structure diagram of the advanced relay communication mode of RS, BS and MS/SS in the prior art is shown in Fig. 3. RS communicates with BS and MS/SS in FDD/TDM/OFDM mode, BS and RS use frequency f2 for downlink, BS Uplink with RS uses frequency f1; MS/SS performs wireless relay access to BS through RS, and RS accesses BS as an MS/SS.

In Figure 3, the RS needs to have two sets of FDD wireless transceivers, that is, FDD transceiver 1 and FDD transceiver 2 in Figure 3, specifically: the first set of transmitter TX1 works at frequency f1, and the receiver RX1 works at frequency f2; the second transmitter TX2 works at frequency f2, and the receiver RX2 works at frequency f1.

In addition, in Figure 3, the DL _BS is the downlink subframe of the BS physical layer frame, from the BS to the SS/MS _BS or RS, and the UL _BS is the uplink subframe of the BS physical layer frame, from the SS/MS _BS or RS To BS, SS/MS _BS , the second set of wireless transceivers of RS and BS keep sending and receiving frame synchronization; DL _RS is the downlink subframe of the physical layer frame of RS, from BS to SS/MS _RS or RS, UL _RS is RS The uplink subframe of the physical layer frame is from SS/MS _RS or RS to BS, and the first set of wireless transceivers of SS/MS _RS and RS maintains the synchronization of sending and receiving frames.

The disadvantages of the above advanced transit communication mode are:

1. The RS needs to have two sets of FDD wireless transceivers, which are complex in structure and high in cost.

2. In the FDD communication mode, there may be mutual interference in the network system communication in the four situations shown in Figure 4(a)-(d). Wherein, TX represents a transmitting module, and RX represents a receiving module.

Contents of the invention

The purpose of the present invention is to provide a wireless relay communication orthogonal frequency division multiplexing access system and method, so that the OFDMA relay communication based on the RS of a single FDD wireless transceiver can be realized in the communication system, and the possible existence of of various disturbances.

The purpose of the present invention is achieved through the following technical solutions:

A wireless relay communication system, comprising a base station BS, a relay station RS and a user terminal, the RS is respectively provided with an interface for communicating with the BS and the user terminal, and a frequency division duplex FDD wireless transceiver is included in the RS, the said The uplink of the FDD wireless transceiver in the RS and the downlink of the FDD wireless transceiver in the BS use the same frequency, and the downlink of the FDD wireless transceiver in the RS and the uplink of the FDD wireless transceiver in the BS use the same frequency. The FDD wireless transmitter 1 physical layer unit and the FDD wireless receiver 1 physical unit included in the first FDD wireless transceiver correspond to the FDD wireless receiver physical layer unit and the FDD wireless transmitter physical layer unit in the BS, and the first FDD wireless transmitter physical layer unit in the user terminal The FDD wireless transmitter 2 physical layer unit and the FDD wireless receiver 2 physical layer unit included in the FDD wireless transceiver correspond to the FDD wireless receiver physical layer unit and the FDD wireless transmitter physical layer unit in the RS.

The user terminal includes:

The physical layer processing unit of the FDD wireless transmitter 1: perform wireless communication with the data link layer processing unit of the FDD wireless transceiver and the FDD wireless receiver physical layer processing unit in the BS that can communicate with it;

The physical layer processing unit of the FDD wireless transmitter 2: perform wireless communication with the data link layer processing unit of the FDD wireless transceiver and the FDD wireless receiver physical layer processing unit in the RS that can communicate with it;

The physical layer processing unit of the FDD wireless receiver 1: perform wireless communication with the data link layer processing unit of the FDD wireless transceiver and the physical layer processing unit of the FDD wireless transmitter in the BS that can communicate with it;

FDD wireless receiver 2 physical layer processing unit: perform wireless communication with the data link layer processing unit of the FDD wireless transceiver and the wireless transmitter physical layer processing unit in the RS that can communicate with it;

The data link layer processing unit of the FDD wireless transceiver: For the data from the physical layer processing unit of the FDD wireless receiver 1 and/or 2, after the data processing of the data link layer of the FDD wireless transceiver, forward it to the FDD wireless transmitter Physical layer processing unit of machine 1 and/or 2.

The RS includes:

FDD wireless transmitter physical layer processing unit: respectively with the FDD wireless receiver physical layer processing unit in the RS or the FDD wireless transceiver data link layer in the RS and the physical layer of the FDD wireless receiver 2 in the user terminal that can communicate with it The processing unit or the BS FDD wireless receiver physical layer processing unit performs wireless communication;

FDD wireless receiver physical layer processing unit: respectively with the FDD wireless transmitter physical layer processing unit in the RS or the FDD wireless transceiver data link layer in the RS and the physical layer of the FDD wireless transmitter 2 in the user terminal that can communicate with it The processing unit or the FDD wireless transmitter physical layer processing unit in the BS performs wireless communication.

The RS includes:

FDD wireless transceiver data link layer processing unit: For the data from the FDD wireless receiver physical layer processing unit, after processing the data of the FDD wireless transceiver data link layer, forward it to the user. After the data from the user is processed in the data link layer of the FDD wireless transceiver, it is forwarded to the physical layer processing unit of the FDD wireless transmitter.

The BS includes:

Wired transmission processing unit: establish communication with the upper-level equipment or a group of base station equipment respectively, and perform information interaction with the upper-level equipment or each base station equipment;

FDD wireless transmitter physical layer processing unit: respectively communicate with the FDD wireless receiver 1 physical layer processing unit in the FDD wireless transceiver data link layer and the user terminal that can communicate with it or the FDD wireless receiver physical layer processing unit in the RS Wireless communication;

FDD wireless receiver physical layer processing unit: respectively communicate with the FDD wireless transmitter 1 physical layer processing unit in the FDD wireless transceiver data link layer and the user terminal that can communicate with it or the FDD wireless transmitter physical layer processing unit in the RS Wireless communication;

FDD wireless transceiver data link layer processing unit: After processing the data received from the FDD wireless receiver physical layer processing unit for the data link layer of the FDD wireless transceiver, forward it to the wired transmission processing unit. After the data received from the wired transmission processing unit is processed by the data link layer of the FDD wireless transceiver, it is forwarded to the physical layer processing unit of the FDD wireless transmitter.

The BS also provides an interface for communicating with the user terminal. When the BS directly communicates with the user terminal under the coverage of the RS, the BS transmits the preamble by using a different channel coding and modulation method or different transmission power from other transmitted data. Preamble, frame control header FCH, downlink mapping table DL-MAP and uplink mapping table UL-MAP information are directly sent to the user terminal through this interface, and the initial ranging Ranging contention time slot and bandwidth request contention time slot of the uplink subframe of the BS , or the ranging subchannel RangingSubchannel, the user terminal uses a different channel coding and modulation mode or different transmission power from other transmitted data, and the user terminal directly sends it to the BS without relaying through the RS.

A method for realizing wireless relay communication based on the above system, comprising:

A. In the downlink subframe and uplink subframe of the physical layer frame structure of the BS, the downlink transit area and the uplink transit area are respectively set in the TDM mode of time division multiplexing, and in the uplink subframe of the physical layer frame structure of the FDD wireless receiver of the RS Set the downlink transit area, which is used to define the combination of subchannels and OFDMA symbols in the downlink transit area of the RS receiving BS, and set the uplink transit area in the downlink subframe of the physical layer frame structure of the FDD wireless transmitter of the RS, used to define the RS The sub-channel and OFDMA symbol combination of the uplink transit zone of the receiving BS;

B. The uplink and downlink physical layer frames of the BS and RS set up between the BS, the RS and the user terminal adopt the FDD method for wireless relay communication.

Described step A also includes:

During the period corresponding to the uplink transit area of the BS, the user terminal belonging to the BS does not arrange any transmission subchannel and OFDMA symbol combination; during the period corresponding to the downlink transit area of the BS, the user terminal belonging to the RS does not arrange any transmission subchannel and OFDMA symbol combination OFDMA symbol combination, the uplink and downlink transfer areas set in the BS and RS are selected and set in each frame.

Described step A also includes:

When there are at least two RSs, the at least two RSs share the downlink or uplink transit zone through different combinations of subchannels and OFDMA symbols, and the FDD wireless transmitters of different RSs only use the corresponding subchannels and OFDMA symbols in the downlink transit zone The relay data of the BS is sent in the combination, and the relay data of the BS is not arranged in other combinations of sub-channels and OFDMA symbols. The FDD wireless receivers of different RSs only receive the BS in the corresponding sub-channels and OFDMA symbol combinations in the downlink relay area. The relay data of the receiving BS is not arranged in other combinations of subchannels and OFDMA symbols.

Described step A also includes:

Set the downlink relay broadcast subchannel in the downlink subframe of the physical layer frame structure of the BS, which is used to define the combination of downlink subchannels and OFDMA symbols broadcast by the BS to the RS;

Set the downlink relay broadcast subchannel in the downlink subframe of the physical layer frame structure of the FDD wireless receiver of the RS, which is used to define the RS uplink subchannel and OFDMA symbol combination for receiving the BS downlink relay broadcast;

The downlink relay broadcast sub-channels set in the BS and RS are selected and set in each frame.

Described step A also includes:

Define the relay ranging subchannel in the uplink transit area of the uplink subframe of the physical layer frame structure of the BS, and define the BS relay ranging receiving subchannel for the initial access ranging Ranging, periodic ranging Ranging, and bandwidth request of the RS Channel and OFDMA symbol combination, the relay ranging sub-channel can also be used as the user terminal's initial access ranging Ranging, periodic ranging Ranging, and bandwidth request ranging sub-channel;

Set the relay ranging sub-channel in the downlink transit area of the physical layer frame structure of the FDD wireless transmitter of the RS, which is used to define the initial access ranging Ranging of the RS, the periodic ranging Ranging, and the RS relay ranging transmission of the bandwidth request Combination of subchannels and OFDMA symbols;

The time-frequency relationship of the transit ranging sub-channels set in the BS and RS must be in one-to-one correspondence, strictly synchronized, and selected and set in each frame.

Described step A also includes:

In the uplink subframe of the physical layer frame structure of the BS or the downlink subframe of the physical layer frame structure of the RS FDD wireless transmitter, the BS receiver and different The FDD wireless transmitter of the RS shares the RS downlink subframe or the rest of the BS uplink subframe through different combinations of subchannels and OFDMA symbols;

In the downlink subframe of the physical layer frame structure of the BS or the uplink subframe of the physical layer frame structure of the RS FDD wireless receiver, in addition to the downlink subframe header, downlink subframe header reception and downlink transit area, the BS transmitter Share the BS downlink subframe or the rest of the uplink subframe of the RS FDD wireless receiver with FDD wireless receivers of different RSs through different combinations of subchannels and OFDMA symbols.

Described step A also includes:

The downlink subframe header is defined in the downlink subframe of the physical layer frame structure of the BS. The downlink subframe header is the beginning of the downlink subframe, which is used to define the subchannel and OFDMA symbol combination for sending user synchronization information and the subchannel for sending indication information. Channel and OFDMA symbol combination to indicate the position and usage method profile of each subchannel and OFDMA symbol combination of the BS physical layer frame structure downlink subframe and uplink subframe, and the downlink subframe header is set in each frame.

Described step A also includes:

When the BS cannot communicate directly with the user terminal under the coverage of the RS, the downlink subframe header is defined in the downlink subframe of the physical layer frame structure of the FDD wireless transmitter of the RS. The downlink subframe header is the beginning of the downlink subframe, and is used It is used to define the combination of subchannels and OFDMA symbols for sending user synchronization information and the combination of subchannels and OFDMA symbols for sending indication information, so as to indicate the positions and combinations of subchannels and OFDMA symbols of the downlink subframe and uplink subframe of the RS physical layer frame structure Using the profile method, the downlink subframe header is set in each frame.

Described step A also includes:

When the BS cannot directly communicate with the user terminal under the coverage of the RS, the downlink subframe header defined in the downlink subframe of the physical layer frame structure of the FDD wireless transmitter of the RS lags behind the physical The downlink subframe header defined in the downlink subframe of the layer frame structure, and during the downlink subframe header of the FDD wireless transmitter of the RS, the BS cannot arrange any combination of receiving subchannels and OFDMA symbols.

Described step A also includes:

When there are at least two RSs, during the downlink subframe header of the FDD wireless transmitter of the RS, the downlink subframes of the physical layer frame structure of the FDD wireless transmitters of other RSs do not arrange any combination of sending subchannels and OFDMA symbols,

or,

When there are at least two RSs, if the downlink subframe headers of the FDD wireless transmitters of different RSs overlap in time, they must completely overlap and be strictly synchronized, and the content of the downlink subframe headers must be the same.

Described step A also includes:

The downlink subframe header reception is set in the physical layer frame structure of the FDD wireless receiver of the RS, which is used to define the subchannel and OFDMA symbol combination of the downlink subframe header receiving the BS, and the downlink subframe header reception and the downlink subframe header of the BS The time-frequency relationship of subframe headers must be in one-to-one correspondence and completely synchronized, and the receiving subchannel of the downlink subframe header is selected and set in each frame.

Described step A also includes:

Define the ranging subchannel in the uplink subframe of the physical layer frame structure of the BS, and define the BS ranging receiving subchannel and OFDMA symbol combination for the user terminal's initial access ranging Ranging, periodic ranging Ranging, and bandwidth request ;

When the BS cannot directly communicate with the user terminal under the coverage of the RS, the ranging sub-channel is defined in the uplink subframe of the physical layer frame structure of the FDD wireless receiver of the RS, and the initial access ranging Ranging for the user terminal is defined. Periodic ranging Ranging, RS ranging receiving subchannel and OFDMA symbol combination for bandwidth request,

The ranging sub-channels defined in the BS and RS are set in each frame.

Described step B specifically comprises:

Uplink and downlink transit areas, downlink transit broadcast subchannels, transit ranging subchannels, downlink subframe headers, and downlink subframes contained in the uplink and downlink physical layer frames of the BS and RS based on the settings between the BS, RS and the user terminal Head receiving and ranging sub-channels carry out message interaction to realize wireless relay communication.

A method for realizing wireless relay communication based on OFDMA-FDD access, comprising:

Downlink communication process from BS to user terminal:

C. The BS sends data to the RS in the downlink subframe of the BS, and the RS receives the data through the FDD wireless receiver of the RS;

D. The RS forwards the received data to the user terminal through the downlink subframe of the FDD wireless transmitter of the RS;

Uplink communication process from user terminal to BS:

E. The user terminal sends uplink communication data in a time-frequency interval other than the period corresponding to the uplink transit area of the BS, and the RS receives the data;

F. The RS sends the uplink transfer communication data to the BS through the uplink transfer area of the downlink subframe, and the BS receives the uplink transfer communication data in the uplink subframe.

Described step C specifically comprises:

C1. The BS sends the preamble in the downlink subframe header of the downlink subframe, and the RS receives the preamble through the downlink subframe header receiving subchannel of the FDD wireless receiver of the RS, and synchronizes with the BS;

C2. After the BS sends the preamble in the downlink subframe, it sends FCH, DL-MAP and UL-MAP information, and the RS receives the FCH, DL-MAP information through the downlink subframe head receiving subchannel of the FDD wireless receiver of the RS. MAP and UL-MAP information, obtain the subchannel and OFDMA symbol combination position and usage method profile information of the BS downlink and uplink bursts;

C3. The BS uses the downlink relay broadcast in the downlink transfer area of the downlink subframe to send a broadcast message. The BS sends the downlink transfer communication data to the RS in the downlink transfer RS in the downlink transfer area of the downlink subframe. The RS passes through the FDD wireless receiver of the RS The downlink transfer broadcast sub-channel receives the broadcast message, and the RS receives the downlink transfer communication data through the downlink transfer area of the FDD wireless receiver of the RS.

Described step D specifically comprises:

D1. Send a preamble in the downlink subframe header of the downlink subframe of the FDD wireless transmitter of the RS, the user terminal receives the preamble, and obtains synchronization with the RS;

D2. The FDD wireless transmitter of the RS sends FCH, DL-MAP, and UL-MAP information in the downlink subframe. The FCH, DL-MAP, and UL-MAP information can be sent by the BS to the RS, and the user terminal receives the FCH, DL-MAP -MAP, UL-MAP information, obtain the subchannel and OFDMA symbol combination position and usage method profile information of each burst of RS downlink and uplink;

D3. The FDD wireless transmitter of the RS sends downlink transfer communication data to the user terminal in the time-frequency interval of the downlink subframe except the downlink subframe header and the downlink transfer area, and the transfer communication data is sent by the BS to the FDD wireless transmitter of the RS The transmitter, the user terminal receives the downlink transfer communication data from the corresponding time-frequency interval;

or

D4. The user terminal receives the preamble in the downlink subframe header of the BS's downlink subframe, synchronizes with the BS, and the user terminal receives the FCH, DL-MAP and UL-MAP information in the downlink subframe header of the BS's downlink subframe , obtain the subchannel and OFDMA symbol combination position and usage method profile information of the downlink and uplink bursts of the BS and the RS;

D5. In the downlink subframe, the FDD wireless transmitter of the RS sends the downlink transfer communication data to the user terminal in the time-frequency interval except the downlink subframe header and the downlink transfer area, and the transfer communication data is sent by the BS to the RS The FDD wireless transmitter, the user terminal receives the downlink transfer communication data from the corresponding time-frequency interval.

Described step E specifically comprises:

E1. After the user terminal receives the FCH, DL-MAP, and UL-MAP information, it obtains the downlink and uplink subchannels of the FDD wireless transmitter of the RS and the OFDMA symbol combination position and usage method profile information of the FDD wireless transmitter of the RS. In the uplink subframe of the FDD wireless receiver of the RS, send the uplink communication data to the RS in the time-frequency interval except the period corresponding to the uplink transit area of the BS, and the FDD wireless receiver of the RS receives the uplink communication data from the corresponding time-frequency interval;

or

E2. After receiving the FCH, DL-MAP, and UL-MAP information of the downlink subframe header of the downlink subframe of the BS, the user terminal obtains the combination and use of the subchannels and OFDMA symbols of the downlink and uplink bursts of the BS and RS Method profile information, the user terminal sends uplink communication data to the RS in the uplink subframe of the FDD wireless receiver of the RS in the time-frequency interval except the period corresponding to the uplink transit area of the BS, and the FDD wireless receiver of the RS sends the uplink communication data to the RS from the corresponding time-frequency interval The uplink communication data is received.

Described step F specifically comprises:

F1. The FDD wireless receiver of the RS receives the FCH, DL-MAP and UL-MAP information of the downlink subframe header of the BS's downlink subframe, and obtains the subchannel and OFDMA symbol combination position and usage method profile of each downlink and uplink burst of the BS information;

F2. The FDD wireless transmitter of the RS sends the uplink relay communication data to the BS in the uplink transfer RS of the uplink transfer area of the downlink subframe of the RS, and the transfer communication data is sent by the BS to the RS, and the BS is in the uplink transfer area of the uplink subframe The uplink relay communication data is received in the uplink relay RS.

It can be seen from the above-mentioned technical solution provided by the present invention that the present invention defines the physical layer frame structure of BS and RS by introducing a mechanism combining FDD, TDM and OFDM (or SC). Compared with the prior art, the present invention has the following advantages :

1. Support OFDMA (or SOFDMA) wireless advanced transfer mode, that is, MS/SS can perform wireless transfer access to BS through RS;

2. Support OFDMA (or SOFDMA) wireless simplified transfer mode, that is, the downlink data message of BS or the message message except DL-MAP and UL-MAP can be transferred through RS; other uplink bursts of BS, except MS/ SS's initial access ranging Ranging, periodic ranging Ranging, and bandwidth request messages can be relayed through RS;

3. RS only needs a set of FDD wireless transceivers to effectively ensure communication between RS and BS, MS/SS in FDD/TDM/TDMA mode, with simple structure and low cost;

4. Can avoid "RS to SS/MS _BS ", "BS to SS/MS _RS ", "SS/MS _BS to RS", "SS/MS _RS to BS" and "RS to RS" in the prior art self-interference;

4. Can avoid "RS to SS/MS _RS "interference;

5. Can avoid the interference of "SS/MS _BS to BS", "SS/MS _RS to RS", "SS/MS _RS to SS/MS _BS ", "SS/MS _BS to SS/MS _RS ".

Description of drawings

Fig. 1 is a schematic diagram of OFDMA symbol subcarrier adjacent situation;

Fig. 2 is the 802.16 OFDMA (or SOFDMA) frame structure schematic diagram in the communication system based on FDD;

FIG. 3 is a schematic structural diagram of an advanced relay communication mode of RS, BS, and MS/SS in the prior art;

FIG. 4 is a schematic diagram of co-channel interference modes that may exist in a dual FDD-based communication system in the prior art;

FIG. 5 is a schematic diagram of an advanced relay communication mode of RS, BS, and MS/SS according to the present invention;

FIG. 6 is a schematic diagram of a simplified transfer communication mode of RS, BS, and MS/SS according to the present invention;

FIG. 7 is a schematic diagram of co-channel interference modes that may exist in the OFDMA communication system based on single FDD according to the present invention;

FIG. 8 is a schematic diagram of the functional framework of the relay communication system of RS, BS, and MS/SS according to the present invention;

FIG. 9 is a schematic diagram of the physical layer frame structure of the BS and the RS in the advanced transit communication mode according to the present invention;

FIG. 10 is a schematic diagram of the physical layer frame structure of the BS and the RS in the simplified transit communication mode of the present invention.

Detailed ways

The present invention provides a wireless relay communication OFDM access system and method. The advanced relay communication mode of RS, BS and MS/SS provided by the present invention, as shown in FIG. 5, RS and BS, MS/SS The communication between SS adopts FDD/TDM/OFDMA mode, BS downlink and RS uplink use frequency f1, BS uplink and RS downlink use frequency f2; RS only needs a set of FDD wireless transceiver, RS accesses BS as a MS/SS, MS /SS performs wireless relay access to BS through RS.

In Figure 5, DL _BS is the downlink subframe of the BS physical layer frame, from BS to SS/MS _BS or RS, UL _BS is the uplink subframe of BS physical layer frame, from SS/MS _BS or RS to BS , SS/MS _BS and BS keep sending and receiving frames synchronously; DL _RS is the downlink subframe of the physical layer frame of RS, from BS to SS/MS _RS or RS, UL _RS is the uplink subframe of the physical layer frame of RS, from SS /MS _RS or RS to BS, SS/MS _RS and RS keep sending and receiving frames synchronously.

The simplified relay communication mode of RS, BS and MS/SS provided by the present invention is shown in FIG. 6 . BS downlink and RS uplink use frequency f1, BS uplink and RS downlink use frequency f2, and RS only needs a set of FDD wireless transceivers. DL _BS is the downlink subframe of the BS physical layer frame, from BS to SS/MS _BS or RS, UL _BS is the uplink subframe of BS physical layer frame, from SS/MS _BS or RS to BS; SS/MS _BS Or SS/MS _RS and BS keep sending and receiving frames synchronously. DL _RS is the downlink subframe of the RS physical layer frame, from BS to SS/MS _RS or RS, and UL _RS is the uplink subframe of RS physical layer frame, from SS/MS _RS or RS to BS.

The Broadcast Burst (downlink broadcast burst) of DL _BS , such as Preamble, FCH, DL-MAP, UL-MAP, is sent directly by BS to MS/SS without relaying through RS; the initial access ranging of MS/SS, Ranging, Periodic ranging Ranging and bandwidth requests are sent directly by the MS/SS to the BS through the ranging subchannel RangingSubchannel of the UL _BS , without relaying through the RS; for other downlink bursts of the DL _BS , such as data packets or DL-MAP 、Messages other than UL-MAP can not be sent directly by BS to MS/SS, but must be relayed by RS; other uplink bursts of UL _BS , such as ranging and periodic ranging except for initial access of MS/SS Except for the Ranging and bandwidth request messages, they cannot be sent directly from the MS/SS to the BS, but must be relayed through the RS.

In the FDD mode, the above-mentioned advanced and simplified transit communication modes have mutual interference in the four situations shown in Figure 7(a)-(d). Wherein, TX represents a transmitting module, and RX represents a receiving module.

The functional framework of the OFDM access system for wireless relay communication provided by the present invention is shown in FIG. 7 . The OFDM access system for wireless relay communication includes BS, RS and SS/MS.

Among them, BS includes:

Wired transmission processing unit: able to establish communication with upper-level equipment (such as base station controller) or with a group of base station equipment respectively, and perform information interaction with upper-level equipment or each base station equipment;

FDD wireless transceiver: used for wireless communication with RS or SS/MS in FDD mode, composed of FDD wireless transmitter physical layer processing unit, FDD wireless receiver physical layer processing unit and FDD wireless transceiver data link layer processing unit .

Among them, FDD wireless transmitter physical layer processing unit (frequency is f1): FDD wireless receiver 1 physical layer processing unit in FDD wireless transceiver data link layer and SS/MS that can communicate with it or FDD in RS The physical layer processing unit of the wireless receiver performs wireless communication; for the simplified transfer mode, this unit broadcasts the downlink subframe head of the DL _BS (such as Preamble, FCH, DL-MAP, UL-MAP) with higher reliability than other transmitted data The channel coding and modulation method (such as binary phase shift keying BPSK), or use a higher transmission power than other transmitted data, and send it directly from the BS to the MS/SS without relaying through the RS.

Among them, the FDD wireless receiver physical layer processing unit (frequency is f2): FDD wireless transmitter 1 physical layer processing unit in the FDD wireless transceiver data link layer and the SS/MS that can communicate with it or the FDD in the RS The wireless transmitter physical layer processing unit performs wireless communication.

Wherein, the FDD wireless transceiver data link layer processing unit: after processing the received data from the FDD wireless receiver physical layer processing unit for the FDD wireless transceiver data link layer data, forward it to the wired transmission processing unit. After the data received from the wired transmission processing unit is processed by the data link layer of the FDD wireless transceiver, it is forwarded to the physical layer processing unit of the FDD wireless transmitter.

SS/MS includes:

FDD wireless transceiver: used for wireless communication with BS or RS in FDD mode, consisting of physical layer processing units of FDD wireless transmitters 1 and 2, physical layer processing units of FDD wireless receivers 1 and 2, and FDD wireless transceivers The data link layer processing unit is composed.

Among them, the physical layer processing unit of the FDD wireless transmitter 1 (frequency is f2): perform wireless communication with the data link layer processing unit of the FDD wireless transceiver and the FDD wireless receiver physical layer processing unit in the BS that can communicate with it ; For the simplified transfer mode, the unit performs uplink random access (Random Access) slots (or contention slots) of the UL _BS , such as initial Ranging contention slots and bandwidth request contention slots, or MS/SS The initial access ranging Ranging, periodic ranging Ranging, and bandwidth request pass through the ranging subchannel RangingSubchannel of the UL _BS , using channel coding and modulation methods with higher reliability than other data transmissions (such as binary phase shift keying BPSK) , or use a higher transmit power than other sent data, and send it directly from the MS/SS to the BS without relaying through the RS.

The physical layer processing unit of the FDD wireless transmitter 2 (the frequency is f1): perform wireless communication with the data link layer processing unit of the FDD wireless transceiver and the FDD wireless receiver physical layer processing unit in the RS that can communicate with it.

The physical layer processing unit of the FDD wireless receiver 1 (the frequency is f1): perform wireless communication with the data link layer processing unit of the FDD wireless transceiver and the physical layer processing unit of the FDD wireless transmitter in the BS that can communicate with it.

FDD wireless receiver 2 physical layer processing unit (frequency is f2): carry out wireless communication with the data link layer processing unit of the FDD wireless transceiver and the wireless transmitter physical layer processing unit in the RS which can communicate with it;

The data link layer processing unit of the FDD wireless transceiver: For the data from the physical layer processing unit of the FDD wireless receiver 1 and/or 2, after the data processing of the data link layer of the FDD wireless transceiver, forward it to the FDD wireless transmitter Physical layer processing unit of machine 1 and/or 2.

RS includes:

FDD wireless transceiver: used for wireless communication with SS/MS or BS in FDD mode, composed of FDD wireless transmitter physical layer processing unit, FDD wireless receiver physical layer processing unit and FDD wireless transceiver data link layer processing unit .

FDD wireless transmitter physical layer processing unit: respectively with the FDD wireless receiver physical layer processing unit in the RS or the FDD wireless transceiver data link layer in the RS and the physics of the FDD wireless receiver 2 in the SS/MS that can communicate with it Layer processing unit or BS FDD wireless receiver physical layer processing unit for wireless communication;

FDD wireless receiver physical layer processing unit: respectively with the FDD wireless transmitter physical layer processing unit in the RS or the FDD wireless transceiver data link layer in the RS and the physics of the FDD wireless transmitter 2 in the SS/MS that can communicate with it The layer processing unit or the FDD wireless transmitter physical layer processing unit in the BS performs wireless communication;

FDD wireless transceiver data link layer processing unit: For the data from the FDD wireless receiver physical layer processing unit, after processing the data of the FDD wireless transceiver data link layer, forward it to the user. After the data from the user is processed in the data link layer of the FDD wireless transceiver, it is forwarded to the physical layer processing unit of the FDD wireless transmitter.

In order to realize the above-mentioned wireless relay communication OFDM access system, the present invention needs to set a reasonable physical layer frame structure of BS and RS, so as to ensure that the transfer communication process can be reliably realized, and at the same time, it can also effectively avoid the problem shown in Figure 7. various interferences that may exist.

In the implementation scheme 1 of the physical layer frame structure of BS and RS, the following settings need to be made:

1. TDM technology is adopted in the downlink subframe DL _BS whose physical layer frame structure frequency is f1, and the DL Relay Zone (downlink transfer zone) is added to define the BS downlink intermediate rotor channel and OFDMA transmitted from the BS to the RS Symbol combination; in the case of multiple RSs, multiple RSs share the DL Relay Zone through different sub-channels and OFDMA symbol combinations;

2. Adopt TDM technology in the uplink subframe UL _RS of the physical layer frame structure of the RX (FDD wireless receiver) whose frequency is f1, and open up a "DL Relay Zone (downlink transfer zone)", which is used to define the RS receiving BS The sub-channel and OFDMA symbol combination of the DL Relay Zone; for the case of multiple RSs, multiple RSs share the DL Relay Zone through different combinations of sub-channels and OFDMA symbols, and the RXs of different RSs are only in the corresponding sub-channels in the DL Relay Zone The relay data of the BS is received in the combination with the OFDMA symbol, and the relay data of the BS is not arranged for other sub-channels and OFDMA symbol combinations;

3. TDM technology is adopted in the uplink subframe UL _BS with the frequency of f2 in the physical layer frame structure of the BS, and the UL Relay Zone (uplink transfer zone) is added to define the BS uplink intermediate rotor channel and OFDMA transmitted from the RS to the BS Symbol combination; in the case of multiple RSs, multiple RSs share the UL Relay Zone through different combinations of subchannels and OFDMA symbols;

4. Adopt TDM technology in the downlink subframe DL _BS of the physical layer frame structure of the TX (FDD wireless transmitter) whose frequency is f2 of the RS, and open up the UL Relay Zone (uplink transfer zone), which is used to define the UL of the RS receiving the BS The sub-channel and OFDMA symbol combination in the Relay Zone; for the case of multiple RSs, multiple RSs share the UL Relay Zone through different combinations of sub-channels and OFDMA symbols, and the TX of different RSs is only in the corresponding sub-channel and OFDMA in the DL Relay Zone Transit data of the BS is sent in the symbol combination, and other subchannels and OFDMA symbol combinations cannot be arranged for transmission;

5. During the period corresponding to the UL Relay Zone of the BS, the SS/MS _BS does not arrange any combination of transmission subchannels and OFDMA symbols to avoid interference from "SS/MS _BS to BS"; during the period corresponding to the DL Relay Zone of the BS, the SS/MS MS _RS does not arrange any combination of sending subchannels and OFDMA symbols to avoid interference from "SS/MS _RS to RS";

6. Create a "DL Relay Broadcast Subchannel" in the DL Relay Zone of the downlink subframe DL _BS with the frequency f1 of the physical layer frame structure of the BS, which is used to define the downlink subchannel broadcast by the BS to the RS Combined with OFDMA symbols, broadcast DCD, UCD, FPC, CLK CMP broadcast messages defined by the 802.16 standard;

7. Create a DLRelay Broadcast Subchannel (downlink relay broadcast subchannel) in the DL Relay Zone of the physical layer frame structure of the RX whose RS frequency is f1, which is used to define the RS uplink subchannel and OFDMA symbol combination for receiving the BS downlink relay broadcast. Receive DCD, UCD, FPC, CLK CMP broadcast messages defined by the 802.16 standard;

8. Define the Relay Ranging Subchannel (relay ranging subchannel, abbreviated as RRS) in the UL Relay Zone of the uplink subframe UL _BS with the frequency f2 of the physical layer frame structure of the BS, and define the initial access ranging for the RS Ranging, periodic ranging Ranging, bandwidth request BS relay ranging receiving subchannel and OFDMA symbol combination; this RRS can also be used as SS/MS _BS initial access ranging Ranging, periodic ranging Ranging, bandwidth request ranging for sub-channels;

9. Create a RelayRanging TX Subchannel (relay ranging subchannel, abbreviated as RRS TX) in the DL Relay Zone of the physical layer frame structure of the TX whose frequency is f2 in the RS, which is used to define the initial access ranging Ranging and period of the RS The RS relay ranging transmission subchannel and OFDMA symbol combination of Ranging and bandwidth request;

10. The time-frequency relationship between the Relay Ranging Subchannel of BS and the Relay Ranging TXSubchannel of TX of RS must correspond one-to-one and be strictly synchronized;

11. In the uplink subframe of the BS physical layer frame structure or the downlink subframe of the TX physical layer frame structure of the RS, except for the DL Header, UL Relay Zone and the corresponding period of the DL Header of the TX of the BS in the RX, the BS receiver Share the RS downlink subframe or the rest of the BS uplink subframe with the TX of different RSs through different subchannels and OFDMA symbol combinations to avoid interference from "SS/MS _BS to SS/MS _RS ";

12. In the downlink subframe of the BS physical layer frame structure or the uplink subframe of the RS RX physical layer frame structure, except for DL Header, DL Header RX and DL Relay Zone, the BS transmitter and the RX of different RS pass through Different combinations of subchannels and OFDMA symbols share the rest of the BS downlink subframe or the RX uplink subframe of the RS, avoiding interference from "SS/MS _RS to SS/MS _BS ";

13. Define the DL Header (downlink subframe header) in the downlink subframe DL _BS whose physical layer frame structure frequency is f1. The DL Header is the beginning of the downlink subframe and is used to define the subchannel for sending user synchronization information Combining with OFDMA symbols and sending instruction information subchannels and OFDMA symbol combinations to indicate the location and usage method profile of each subchannel and OFDMA symbol combination of the downlink subframe and uplink subframe of the BS physical layer frame structure. The DL Header contains the preamble, FCH, DL-MAP, UL-MAP in the original 802.16 OFDMA (or SOFDMA) frame, and the SS/MSBS, RS and BS maintain frame synchronization for sending and receiving;

14. In the advanced transit communication mode, define a DL Header (downlink subframe header) in the downlink subframe DL _RS of the TX physical layer frame structure with the frequency of the RS being f2, and the DL Header is the beginning of the downlink subframe , which is used to define the combination of subchannels and OFDMA symbols for sending user synchronization information and the combination of subchannels and OFDMA symbols for sending indication information, so as to indicate the combination of subchannels and OFDMA symbols of the downlink subframe and uplink subframe of the RS physical layer frame structure Where and how to use profile. The DLHeader contains the preamble, FCH, DL-MAP, UL-MAP in the original 802.16 OFDMA (or SOFDMA) frame, and the SS/MSRS and RS keep the sending and receiving frame synchronous;

15. In the advanced transit communication mode, the TX DL Header of the RS lags behind the DL Header of the BS in time; during the DL Header of the TX of the RS, the BS receiver cannot arrange any combination of receiving subchannels and OFDMA symbols;

16. In the advanced transit communication mode, during the DL Header period of the TX of the RS, the DL _RS of the physical layer frame structure of the TX of other RSs cannot arrange any combination of transmission subchannels and OFDMA symbols, avoiding "RS to SS/MS _RS ” interference; in special cases, if the DLHeaders of TXs of different RSs overlap in time, they must be completely overlapped, strictly synchronized, and their contents must be the same to avoid interference from “RS to SS/MS _RS ”;

17. Open up DLHeader RX (downlink subframe header reception) in the physical layer frame structure of the FDD wireless receiver RX whose RS frequency is f1, to define the subchannel and OFDMA symbol combination of the DL Header of the receiving BS;

18. The time-frequency relationship between the DL Header of the BS and the DL Header RX of the RX of the RS must be one-to-one correspondence and strict synchronization;

19. Define the RangingSubchannel (ranging subchannel) in the uplink subframe _{UL BS} with the frequency of f2 in the physical layer frame structure of the BS, and define the initial access ranging Ranging, periodic ranging Ranging, and BS ranging receiving subchannel and OFDMA symbol combination for bandwidth request;

20. In the advanced transfer communication mode, define a Ranging Subchannel (ranging subchannel) in the uplink subframe UL _RS of the physical layer frame structure of the FDD wireless receiver RX whose frequency of RS is f1, and define a range for SS/ MS _RS initial access ranging Ranging, periodic ranging Ranging, RS ranging receiving subchannel and OFDMA symbol combination for bandwidth request;

21. The DL Header and Ranging Subchannel defined above are set in each frame, and other subchannels and OFDMA symbol combinations or Zones defined above are selected and set in each frame.

According to the physical layer frame structure provided above, the present invention also provides a specific implementation of the physical layer frame structure of BS and RS, as shown in Figure 9 and Figure 10, wherein Figure 9 is the BS in the advanced transit communication mode 10 is a schematic diagram of the physical layer frame structure of the BS and RS in the simplified relay mode. In Figure 9 and Figure 10, the sending and receiving frequencies of RS and BS are subject to the frequency label at the leftmost end of the frame in the figure, where "NULL" or blank part is the part that does not arrange any receiving or sending.

The specific frame structure in Figure 9 and Figure 10 will be described below:

The "white vertical bar area" in the downlink subframe of the BS DL _BS , including the preamble, FCH, DL-MAP and UL-MAP of the DL _BS as the DL Header; the "white vertical bar area" in the RX uplink subframe UL _RS of the RS Strip area", including sync with BS for UL _RS , and DL Header RX for Get MAPinfo.

The DL Relay Zone of the BS (that is, DL Relay broadcast, DL Relay R#1, #2... part) is arranged after the DL Header of the DL _BS in the downlink subframe of the BS, and the UL Relay Zone of the BS (that is, UL Relay R#1 , #2... and the TX part of the RRS) are arranged at the beginning of the downlink subframe DL _BS of the BS. During the period corresponding to the UL Relay Zone of the BS, the SS/MS _BS does not arrange any combination of transmission subchannels and OFDMA symbols; during the period corresponding to the DL Relay Zone of the BS, the SS/MS _RS does not arrange any combination of transmission subchannels and OFDMA symbols .

PHYburst (burst) is assigned a group of adjacent sub-channels and a group of OFDMA symbols (symbol). In the uplink subframe of the BS or the TX downlink subframe of the RS, except for the DL Header, ULRelay Zone and the corresponding period of the DL Header of the TX of the BS in the RX, the TX of the BS receiver and different RSs pass different subchannels and OFDMA The symbol combination shares the rest of the RS downlink subframe or the BS uplink subframe; in the BS downlink subframe or the RS RX uplink subframe, except for DL Header, DLHeader RX and DL Relay Zone, the BS transmitter and different RS RX shares the rest of the BS downlink subframe or the RS RX uplink subframe through different combinations of subchannels and OFDMA symbols.

The present invention also provides a specific processing flow of the wireless relay communication OFDM access system based on the physical layer frame structure of the BS and RS set above, and the corresponding processing flow includes the downlink from the BS to the user terminal The transfer communication processing flow, and the uplink transfer communication processing flow from the user terminal to the BS.

The following first describes the downlink relay communication processing flow. The downlink flow includes two processing stages. The first stage is the communication process from the BS to the RS, and the second stage is the processing process from the RS to the user terminal. Specifically, :

(1) The first stage (BS->RS):

In this stage, the same processing is adopted in the advanced transit communication mode and the simplified transit mode;

1. The BS sends a preamble in the DL Header of the downlink subframe DL _BS with frequency f1.

2. RS#1 receives the preamble in the DL Header of the downlink subframe DL _BS of the BS through the DL Header RX whose RX frequency of the RS is f1, and synchronizes with the BS.

3. The BS sends the FCH, DL-MAP, and UL-MAP information after sending the preamble in the DL Header of the downlink subframe DL _BS with frequency f1.

4. RS#1 receives the FCH, DL-MAP, and UL-MAP information of the DL Header of the downlink subframe DLBS through the DL Header RX of the RX frequency of the RS, and obtains the subchannels and OFDMA of each burst of the BS downlink and uplink Symbol location and usage profile information.

5. The BS uses the DL Relaybroadcast of the DL Relay Zone of the downlink subframe DL _BS with frequency f1 to send a broadcast message message;

6. The BS sends the downlink relay communication data traffic data to RS#1 in the DL Relay RS#1 of the DL Relay Zone of the DL _BS in the downlink subframe with frequency f1;

7. RS#1 receives the broadcast message in the DL Relay broadcast of the DL Relay Zone of the DL Relay Zone of the BS downlink subframe DL _BS through the DL RB with the RX frequency of the RS, which may contain the message that RS#1 needs to relay the broadcast;

8. The RS#1 receives the downlink transit communication data in the DL Relay RS#1 of the DL Relay Zone in the DL Relay Zone of the BS downlink subframe DL _BS through the DL Relay Zone whose RX frequency of the RS is f1.

(2) The second stage (RS->MS/SS):

For the advanced transit communication mode, the processing at this stage includes:

1. The TX of RS#1 sends the preamble in the DL Header with the frequency f2 of the DL _RS in the downlink subframe.

2. The MS/SS receives the preamble in the DL Header of the TX downlink subframe DL _RS of RS#1, and synchronizes with RS#1.

3. After the TX of RS#1 sends the preamble in the DL Header with the DL _RS frequency of f2 in the downlink subframe, it sends FCH, DL-MAP, and UL-MAP; among them, the FCH, DL-MAP, and UL-MAP of RS#1 The MAP may be sent by the BS to RS#1 in step 6 of the first phase.

4. The MS/SS receives the FCH, DL-MAP, and UL-MAP information of the DL Header of the DL _RS in the TX downlink subframe of RS#1, and obtains the subchannels and OFDMA symbol positions of the downlink and uplink bursts of RS#1 and Use method (profile) information.

5. In the downlink subframe DL _RS , the TX of RS#1 sends the downlink transit communication data traffic data to the MS/SS at the frequency f2 in the time-frequency interval except the DL Header and the DL Relay Zone, and the transit communication data described above TX that has been sent by BS to RS#1 in step 6.

6. The MS/SS receives the downlink transit communication data in the TX downlink subframe DL _RS of RS#1 from the corresponding time-frequency interval.

For the simplified transit communication mode, the processing at this stage specifically includes:

1. The MS/SS receives the preamble in the DL Header of the BS's downlink subframe DL _BS , thereby obtaining synchronization with the BS.

2. The MS/SS receives the FCH, DL-MAP, and UL-MAP information of the DL Header of the BS's downlink subframe DL _BS , and obtains the subchannels and OFDMA symbol positions and usage methods of each downlink and uplink burst of the BS and RS#1 (profile) information.

3. In the downlink subframe DL _RS , the TX of RS#1 sends the downlink transit communication data traffic data to the MS/SS at the frequency f2 in the time-frequency interval except the DL Header and the DL Relay Zone, and the transit communication data described above TX that has been sent by the BS to RS #1 in step 6 of the first phase.

4. The MS/SS receives the downlink transit communication data in the TX downlink subframe DL _RS of RS#1 from the corresponding time-frequency interval.

The following describes the uplink relay communication processing flow. The uplink flow also includes two processing stages. The first stage is the communication process from the user terminal to the RS, and the second stage is the processing process from the RS to the BS. Specifically for:

(1) The first stage (MS/SS->RS):

In this stage, for the advanced transit communication mode, the corresponding processing process includes:

1. The MS/SS receives the FCH, DL-MAP, and UL-MAP of the DL Header's FCH, DL-MAP, and UL-MAP in the downlink subframe DL _RS of the TX of RS#1, and obtains the downlink and uplink bursts of the first set of wireless transmitters of RS#1. The subchannel and OFDMA symbol position and usage (profile) information of the subchannel.

2. In the RX uplink subframe UL _RS of RS#1, the MS/SS sends the uplink communication data traffic data to RS#1 at frequency f1 in the time-frequency interval except the period corresponding to the UL Relay Zone of the BS.

3. The RX of RS#1 receives the uplink communication data traffic data in the MS/SS uplink subframe UL _RS from the corresponding time-frequency interval with the frequency f1.

In this stage, for the simplified transit communication mode, the corresponding processing process includes:

1. The MS/SS receives the FCH, DL-MAP, and UL-MAP of the DL Header of the downlink subframe DL _BS frequency f1 of the BS, and obtains the subchannels and OFDMA symbol positions and usage of the downlink and uplink bursts of the BS and RS#1 Method (profile) information.

2. In the RX uplink subframe UL _RS of RS#1, the MS/SS sends the uplink communication data traffic data to RS#1 at frequency f1 in the time-frequency interval except the period corresponding to the UL Relay Zone of the BS.

3. The RX of RS#1 receives the uplink communication data traffic data in the MS/SS uplink subframe UL _RS from the corresponding time-frequency interval with the frequency f1.

(2) The second stage (RS->BS):

In this stage, the advanced transit communication mode and the simplified transit communication mode adopt the same processing method;

1. The RX of RS#1 receives the FCH, DL-MAP and UL-MAP of the "DL Header" with a frequency of f1 in the downlink subframe DL _BS of the BS, and obtains the subchannels and OFDMA symbol positions of the downlink and uplink bursts of the BS and Use method (profile) information.

2. The TX of RS#1 sends the uplink transit communication data traffic data to the BS in the UL Relay RS#1 of the UL Relay Zone of the DL _RS in the downlink subframe of the RS with frequency f2, and the transit communication data is in the step of the first stage 2 has been sent by the BS to RS#1.

3. The BS receives the uplink relay communication data traffic data in S5 in the UL Relay RS#1 of the UL Relay Zone of the uplink subframe UL _BS with frequency f2.

In summary, the present invention defines the BS and RS physical frame structures in the FDD/OFDMA/TDM advanced transfer communication mode and the simplified transfer communication mode by introducing a mechanism combining FDD, TDM and OFDMA, and realizes that RS only needs one BS, RS and SS/MS wireless relay communication orthogonal frequency division multiplexing access system with FDD wireless transceiver.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (24)

1, a kind of wireless transfer communication system, it is characterized in that, comprise base station BS, terminal RS and user terminal, this RS provides the interface with BS and user terminal communication respectively, and in this RS, comprise a FDD transceiver, FDD transceiver among the described RS up with BS in the identical frequency of the descending employing of FDD transceiver, FDD transceiver among the RS descending with BS in the identical frequency of the up employing of FDD transceiver, wherein, FDD transmitting set 1 physical layer element that a FDD transceiver in the user terminal comprises and FDD wireless receiver 1 physical location are corresponding with FDD wireless receiver physical layer element and FDD transmitting set physical layer element among the BS, and FDD transmitting set 2 physical layer elements that the 2nd FDD transceiver in the user terminal comprises and FDD wireless receiver 2 physical locations are corresponding with FDD wireless receiver physical layer element and FDD transmitting set physical layer element among the RS.

2, wireless transfer communication system according to claim 1 is characterized in that, described user terminal comprises:

The physical layer processing unit of FDD transmitting set 1: respectively with the data link layer deals unit of FDD transceiver and the BS that can communicate with in FDD wireless receiver physical layer processing unit carry out radio communication;

The physical layer processing unit of FDD transmitting set 2: respectively with the data link layer deals unit of FDD transceiver and the RS that can communicate with in FDD wireless receiver physical layer processing unit carry out radio communication;

The physical layer processing unit of FDD wireless receiver 1: respectively with the data link layer deals unit of FDD transceiver and the BS that can communicate with in the physical layer processing unit of FDD transmitting set carry out radio communication;

FDD wireless receiver 2 physical layer processing unit: respectively with the data link layer deals unit of FDD transceiver and the RS that can communicate with in the transmitting set physical layer processing unit carry out radio communication;

The data link layer deals unit of FDD transceiver: to data from the physical layer processing unit of FDD wireless receiver 1 and/or 2, after making the data processing of FDD transceiver data link layer, be transmitted to the physical layer processing unit of FDD transmitting set 1 and/or 2.

3, wireless transfer communication system according to claim 1 is characterized in that, described RS comprises:

FDD transmitting set physical layer processing unit: respectively with RS in FDD wireless receiver physical layer processing unit or the FDD transceiver data link layer among the RS and the user terminal that can communicate with in the physical layer processing unit or the BS FDD wireless receiver physical layer processing unit of FDD wireless receiver 2 carry out radio communication;

FDD wireless receiver physical layer processing unit: respectively with RS in FDD transmitting set physical layer processing unit or the FDD transceiver data link layer among the RS and the user terminal that can communicate with in the physical layer processing unit of FDD transmitting set 2 or the FDD transmitting set physical layer processing unit among the BS carry out radio communication.

4, wireless transfer communication system according to claim 3 is characterized in that, described RS comprises:

FDD transceiver data link layer deals unit: to data from FDD wireless receiver physical layer processing unit, make the data processing of FDD transceiver data link layer after, be transmitted to the user.To from user's data, make the data processing of FDD transceiver data link layer after, be transmitted to FDD transmitting set physical layer processing unit.

5, wireless transfer communication system according to claim 2 is characterized in that, described BS comprises:

The wire transmission processing unit: with upper level equipment or set up with one group of base station equipment respectively and communicate by letter, and and upper level equipment or each base station equipment between carry out information alternately;

FDD transmitting set physical layer processing unit: respectively with the FDD transceiver data link layer and the user terminal that can communicate with in FDD wireless receiver 1 physical layer processing unit or the FDD wireless receiver physical layer processing unit among the RS carry out radio communication;

FDD wireless receiver physical layer processing unit: respectively with the FDD transceiver data link layer and the user terminal that can communicate with in FDD transmitting set 1 physical layer processing unit or the FDD transmitting set physical layer processing unit among the RS carry out radio communication;

FDD transceiver data link layer deals unit: after the data from FDD wireless receiver physical layer processing unit that will receive are made the data processing of FDD transceiver data link layer, be transmitted to the wire transmission processing unit.After the data from wire transmission processing unit unit that receive are made the data processing of FDD transceiver data link layer, be transmitted to FDD transmitting set physical layer processing unit.

6, according to claim 1,2 or 5 described wireless transfer communication system, it is characterized in that, described BS also provides the interface with user terminal communication, when the user terminal direct communication under BS and the RS covering, described BS is by adopting the chnnel coding different with other transmission data and modulation system or different transmitting power with lead code Preamble, frame control head FCH, descending mapping table DL-MAP and up mapping table UL-MAP information directly send to user terminal from this interface, initial ranging Ranging competition slot and bandwidth request competition slot to the sub-frame of uplink of BS, or range finding subchannel RangingSubchannel, user terminal adopts with the different chnnel coding of other transmission data and directly sends to BS by user terminal with modulation system or different transmitting powers, does not carry out transfer by RS.

7, a kind of method of the realization wireless transfer communication based on said system is characterized in that, comprising:

A, in the descending sub frame of BS physical layer frame structure and sub-frame of uplink, adopt the time division multiplexing tdm mode that descending transfer district and up transfer district are set respectively, in the sub-frame of uplink of the physical layer frame structure of the FDD of RS wireless receiver, descending transfer district is set, be used to define rotor channel and the OFDMA symbol combination that RS receives the descending transfer district of BS, in the descending sub frame of the physical layer frame structure of the FDD of RS transmitting set, up transfer district is set, is used to define rotor channel and the OFDMA symbol combination that RS receives the up transfer district of BS;

B, the uplink and downlink physical layer frame based on the BS of described setting and RS between BS, RS and user terminal adopt the FDD mode to carry out wireless transfer communication.

8, the method for realization wireless transfer communication according to claim 7 is characterized in that, described steps A also comprises:

During the up transfer district of BS correspondence, the user terminal that belongs to BS is not arranged any transmission subchannel and OFDMA symbol combination, in during the descending transfer district of BS correspondence, the user terminal that belongs to RS is not arranged any transmission subchannel and OFDMA symbol combination, and the described uplink and downlink transfer district that is provided with in BS and RS selects to be provided with in each frame.

9, the method for realization wireless transfer communication according to claim 7 is characterized in that, described steps A also comprises:

When having at least two RS, these at least two RS share downlink or uplink transfer district by different subchannels and OFDMA symbol combination, the FDD transmitting set of different RS only sends the interim data of BS in corresponding subchannel and the OFDMA symbol combination in descending transfer district, in other subchannel and OFDMA symbol combination, do not arrange to send the interim data of BS, the FDD wireless receiver of different RS only receives the interim data of BS in corresponding subchannel and the OFDMA symbol combination in descending transfer district, do not arrange to receive the interim data of BS in other subchannel and OFDMA symbol combination.

10, the method for realization wireless transfer communication according to claim 7 is characterized in that, described steps A also comprises:

In the descending sub frame of the physical layer frame structure of BS, descending transfer broadcast sub-channels is set, is used to define downlink sub-channels and the OFDMA symbol combination that is broadcast to RS by BS;

In the descending sub frame of the physical layer frame structure of the FDD of RS wireless receiver, descending transfer broadcast sub-channels is set, is used to define the up subchannel of RS and the OFDMA symbol combination that receive the descending transfer broadcasting of BS;

The described descending transfer broadcast sub-channels that is provided with in BS and RS is selected to be provided with in each frame.

11, the method for realization wireless transfer communication according to claim 7 is characterized in that, described steps A also comprises:

Definition transfer range finding subchannel in the up transfer district of the sub-frame of uplink of the physical layer frame structure of BS, definition is used for initial access range finding Ranging, the Perodic ranging Ranging of RS, the BS transfer range finding of bandwidth request receives subchannel and OFDMA symbol combination, and this transfer range finding subchannel also can be used as initial access range finding Ranging, Perodic ranging Ranging, the bandwidth request range finding subchannel of user terminal and uses;

Transfer range finding subchannel is set in the descending transfer district of the physical layer frame structure of the FDD of RS transmitting set, is used to define initial access range finding Ranging, the Perodic ranging Ranging of RS, the RS transfer range finding of bandwidth request sends subchannel and OFDMA symbol combination;

The time-frequency relation of the described transfer range finding subchannel that is provided with in BS and RS must be corresponding one by one, and strict synchronism is selected to be provided with in each frame.

12, the method for realization wireless transfer communication according to claim 7 is characterized in that, described steps A also comprises:

In the descending sub frame of the physical layer frame structure of the FDD transmitting set of the sub-frame of uplink of the physical layer frame structure of BS or RS, during the correspondence in descending sub frame head and up transfer district, the FDD transmitting set of BS receiver and different RS is shared the remainder of RS descending sub frame or BS sub-frame of uplink by different subchannels and OFDMA symbol combination;

In the sub-frame of uplink of the physical layer frame structure of the FDD wireless receiver of the descending sub frame of the physical layer frame structure of BS or RS, receive except that descending sub frame head, descending sub frame head and descending transfer district, the FDD wireless receiver of BS transmitter and different RS is by the remainder of the sub-frame of uplink of the FDD wireless receiver of different subchannels and shared BS descending sub frame of OFDMA symbol combination or RS.

13, the method for realization wireless transfer communication according to claim 7 is characterized in that, described steps A also comprises:

Definition descending sub frame head in the descending sub frame of the physical layer frame structure of BS, this descending sub frame head is the beginning of descending sub frame, be used to define subchannel and OFDMA symbol combination that sends user's synchronizing information and subchannel and the OFDMA symbol combination that sends indication information, with indication BS physical layer frame structure descending sub frame and each subchannel of sub-frame of uplink and the position and the using method profile of OFDMA symbol combination, this descending sub frame head all is provided with in every frame.

14, according to claim 13ly realize wireless method for transfer, it is characterized in that described steps A also comprises based on terminal:

During user terminal direct communication under BS can't cover with RS, definition descending sub frame head in the descending sub frame of the physical layer frame structure of the FDD of RS transmitting set, this descending sub frame head is the beginning of descending sub frame, be used to define subchannel and OFDMA symbol combination that sends user's synchronizing information and subchannel and the OFDMA symbol combination that sends indication information, with indication RS physical layer frame structure descending sub frame and each subchannel of sub-frame of uplink and the position and the using method profile of OFDMA symbol combination, this descending sub frame head all is provided with in every frame.

15, the method for realization wireless transfer communication according to claim 14 is characterized in that, described steps A also comprises:

During user terminal direct communication under BS can't cover with RS, the descending sub frame head that defines in the descending sub frame of described physical layer frame structure at the FDD of RS transmitting set lags behind the descending sub frame head that defines in the descending sub frame of described physical layer frame structure at BS in time, and during the descending sub frame head of the FDD of RS transmitting set, BS can not arrange any reception subchannel and OFDMA symbol combination.

16, the method for realization wireless transfer communication according to claim 14 is characterized in that, described steps A also comprises:

When having at least two RS, during the descending sub frame head of the FDD of RS transmitting set, the descending sub frame of the physical layer frame structure of the FDD transmitting set of other RS is not arranged any transmission subchannel and OFDMA symbol combination,

Or,

When having at least two RS, if the descending sub frame head of the FDD transmitting set of different RS is overlapping in time, then must be overlapping fully, strict synchronism, and its descending sub frame head content must be identical.

17, the method for realization wireless transfer communication according to claim 14 is characterized in that, described steps A also comprises:

The descending sub frame head is set in the physical layer frame structure of the FDD of RS wireless receiver to be received, be used to define the subchannel and the OFDMA symbol combination of the descending sub frame head that receives BS, the time-frequency relation of the descending sub frame head of this descending sub frame head reception and described BS must be corresponding one by one, fully synchronously, this descending sub frame head receives subchannel and select setting in each frame.

18, the method for realization wireless transfer communication according to claim 7 is characterized in that, described steps A also comprises:

Definition range finding subchannel in the sub-frame of uplink of the physical layer frame structure of BS, definition are used for initial access range finding Ranging, the Perodic ranging Ranging of user terminal, the BS range finding of bandwidth request receives subchannel and OFDMA symbol combination;

During user terminal direct communication under BS can't cover with RS, definition range finding subchannel in the sub-frame of uplink of the physical layer frame structure of the FDD of RS wireless receiver, definition is used for initial access range finding Ranging, the Perodic ranging Ranging of user terminal, the RS range finding of bandwidth request receives subchannel and OFDMA symbol combination

The described range finding subchannel that defines in BS and RS all is provided with in every frame.

According to the method for each described realization wireless transfer communication of claim 7 to 18, it is characterized in that 19, described step B specifically comprises:

The up-downgoing transfer district that comprises in the uplink and downlink physical layer frame based on BS that is provided with and RS between BS, RS and user terminal, descending transfer broadcast sub-channels, transfer range finding subchannel, descending sub frame head, descending sub frame head receive, the range finding subchannel carries out the mutual of message, realize wireless transfer communication.

20, a kind of method based on OFDM access OFDMA-FDD realization wireless transfer communication is characterized in that, comprising:

By the downlink communication process of BS to user terminal:

C, BS send data to RS in the descending sub frame of BS, RS receives described data by the FDD wireless receiver of RS;

D, RS transmit the described data that receive by the descending sub frame of the FDD transmitting set of RS and give user terminal;

By the uplink communication process of user terminal to BS:

The interval uplink communication data that send of E, the user terminal time-frequency during the up transfer district correspondence of BS, RS receives this data;

F, RS send up transfer communication data to BS by the up transfer district of descending sub frame, and BS receives this up transfer communication data in sub-frame of uplink.

21, the method that realizes wireless transfer communication based on OFDMA-FDD according to claim 20 is characterized in that described step C specifically comprises:

C1, BS send lead code in the descending sub frame head of descending sub frame, the descending sub frame head of RS by the FDD wireless receiver of RS receives that subchannel receives this lead code and BS obtains synchronously;

C2, BS have sent described lead code in descending sub frame after, send FCH, DL-MAP and UL-MAP information, the descending sub frame head of RS by the FDD wireless receiver of RS receives subchannel and receives this FCH, DL-MAP and UL-MAP information, obtains subchannel and OFDMA symbol combination position and the using method profile information of descending and up each burst of BS;

C3, BS utilize the descending transfer broadcast transmission broadcast in the descending transfer district of descending sub frame, BS sends descending transfer communication data to RS in the descending transfer RS in the descending transfer district of descending sub frame, RS receives described broadcast by the descending transfer broadcast sub-channels of the FDD wireless receiver of RS, and RS receives described descending transfer communication data by the descending transfer district of the FDD wireless receiver of RS.

22, the method that realizes wireless transfer communication based on OFDMA-FDD according to claim 21 is characterized in that described step D specifically comprises:

D1, send lead code in the descending sub frame head of the descending sub frame of the FDD of RS transmitting set, user terminal receives this lead code and RS obtains synchronously;

The FDD transmitting set of D2, RS sends FCH, DL-MAP, UL-MAP information in descending sub frame, this FCH, DL-MAP, UL-MAP information can send to RS by BS, user terminal receives this FCH, DL-MAP, UL-MAP information, obtains subchannel and OFDMA symbol combination position and the using method profile information of descending and up each burst of RS;

The FDD transmitting set of D3, RS sends descending transfer communication data to user terminal in the time-frequency interval except that descending sub frame head, descending transfer district of descending sub frame, described transfer communication data send to the FDD transmitting set of RS by BS, and user terminal is from interval these the descending transfer communication data that receive of corresponding time-frequency;

Or

Lead code in the descending sub frame head of the descending sub frame of D4, user terminal reception BS, obtain synchronously with BS, FCH, DL-MAP and UL-MAP information in the descending sub frame head of the descending sub frame of user terminal reception BS, subchannel and OFDMA symbol combination position and the using method profile information of descending and up each burst of acquisition BS and RS;

The FDD transmitting set of D5, RS is in descending sub frame, send descending transfer communication data to user terminal in the interval of the time-frequency except that descending sub frame head, descending transfer district, described transfer communication data send to the FDD transmitting set of RS by BS, and user terminal is from interval these the descending transfer communication data that receive of corresponding time-frequency.

23, the method that realizes wireless transfer communication based on OFDMA-FDD according to claim 22 is characterized in that described step e specifically comprises:

After E1, user terminal receive described FCH, DL-MAP, UL-MAP information, subchannel and OFDMA symbol combination position and the using method profile information of descending and up each burst of the FDD transmitting set of acquisition RS, user terminal is in the sub-frame of uplink of the FDD of RS wireless receiver, the interval uplink communication data that send of time-frequency during the up transfer district correspondence of BS are to RS, and the FDD wireless receiver of RS is from interval these uplink communication data that receive of corresponding time-frequency;

Or

After E2, user terminal receive FCH, DL-MAP, the UL-MAP information of descending sub frame head of descending sub frame of described BS, obtain subchannel and OFDMA symbol combination and the using method profile information of descending and up each burst of BS and RS, user terminal is at the sub-frame of uplink of the FDD of RS wireless receiver, the interval uplink communication data that send of time-frequency during the up transfer district correspondence of BS are to RS, and the FDD wireless receiver of RS is from interval these uplink communication data that receive of corresponding time-frequency.

24, the method that realizes wireless transfer communication based on OFDMA-FDD according to claim 23 is characterized in that described step F specifically comprises:

The FDD wireless receiver of F1, RS receives FCH, DL-MAP and the UL-MAP information of descending sub frame head of the descending sub frame of BS, obtains subchannel and OFDMA symbol combination position and the using method profile information of descending and up each burst of BS;

The FDD transmitting set of F2, RS sends up transfer communication data to BS in the up transfer RS in the up transfer district of the descending sub frame of RS, these transfer communication data send to RS by BS, and BS receives these up transfer communication data in the up transfer RS in the up transfer district of sub-frame of uplink.

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