CN1722640A - A multi-carrier based public physical channel assignment method - Google Patents

Abstract

The present invention relates to a method for allocating common physical channels based on multiple carriers, comprising: for each cell/sector, for the area covered by multiple carriers, one carrier is determined from the allocated N carriers as the first primary carrier, and another One carrier is used as the second main carrier, and the rest of the carriers are used as auxiliary carriers, and one of the auxiliary carriers can be used as the backup auxiliary carrier of the first main carrier or the second main carrier; in the same cell/sector, the first main carrier, the second main carrier The main carrier and the auxiliary carrier use the same scrambling code and basic training sequence; the common physical channel is configured on the first main carrier or the second main carrier. The method of the invention overcomes the problems of coverage, system capacity, reliability and the like of the multi-carrier-based TD-SCDMA communication system.

Description

A Multi-Carrier Based Common Physical Channel Allocation Method

technical field

The invention relates to a public physical channel allocation method of a wireless communication system, in particular to a multi-carrier-based public physical channel allocation method in a TD-SCDMA communication system.

Background technique

The current TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, or LCR TDD) standard does not consider multi-carrier characteristics, and the allocation scheme for TD-SCDMA public physical channels is mainly included in the following 3GPP protocol standards:

(1) 3GPP TS 25.221: "Physical channels and mapping of transport channels on to physical channels (TDD)"

(2) 3GPP TS 25.222: "Multiplexing and channel coding (TDD)"

(3) 3GPP TS 25.223: "Spreading and modulation (TDD)"

(4) 3GPP TS 25.224: "Physical Layer Procedures (TDD)"

(5) 3GPP TS 25.331: "Radio Resource Control (RRC)"

Through the analysis, it can be seen that the operation and configuration of radio resources on the Uu interface in the above documents are all for one carrier, and only one absolute frequency point number is configured for one cell during the establishment of the Iub interface cell. If multiple carriers are used, each carrier can be called a logical cell, and each logical cell needs to send its own pilot and broadcast information, so each carrier of the multi-carrier system must be configured with a complete set of common channels. Among them, the broadcast channel (BCH), forward access channel (FACH) and paging channel (PCH) all adopt the whole cell coverage mode, so the multi-carrier base station (Node B) not only requires a lot of transmitter power in the actual network planning High, and in the case of the same frequency network, the interference of the inter-wave broadcast channel is also very serious. If the user terminal (UE) is located at the junction of the cell, there must be problems such as difficult cell search, complicated UE measurement, and difficult handover. The system efficiency lower.

In addition, according to the current TD-SCDMA standard, a total of 32 code groups are included, and each code group only includes 8 SYNC_UL codes. Areas are prone to access conflicts or difficult access.

Contents of the invention

The technical problem to be solved by the present invention is to provide a multi-carrier-based public physical channel allocation method to overcome the problems of coverage, system capacity and reliability of the multi-carrier-based TD-SCDMA communication system.

The present invention further provides a method for allocating common physical channels based on multi-carriers, which solves the problems of cell search difficulty, UE measurement complexity, handover difficulty and the like when the user terminal UE is at the cell handover point, and improves system efficiency.

The present invention further provides a method for allocating public physical channels based on multi-carriers, which solves the phenomenon that access conflicts or difficult accesses are likely to occur in areas where users are densely populated.

In order to achieve the above object, the present invention provides a method for allocating common physical channels based on multi-carriers, which is characterized in that it comprises the following steps:

For the area covered by multiple carriers, for each cell/sector, one carrier is determined from the assigned N carriers as the first primary carrier, another carrier is determined as the second primary carrier, and the remaining carriers are used as secondary carriers. The carrier can be used as a backup auxiliary carrier for the first primary carrier or the second primary carrier;

In the same cell/sector, the first main carrier, the second main carrier and the auxiliary carrier use the same scrambling code and basic training sequence;

configuring a common physical channel on the first primary carrier or the second primary carrier;

The above-mentioned multi-carrier-based public physical channel allocation method is characterized in that the step of configuring the public physical channel may include the following steps:

Configure the primary common control physical channel P-CCPCH, which is used to carry the data of the broadcast channel BCH, and provide system information broadcast in the whole cell coverage mode;

Configure the Secondary Common Control Physical Channel S-CCPCH to carry the data of the Paging Channel PCH and the Forward Access Channel FACH;

Configure the fast physical random access channel FPACH to support the establishment of uplink synchronization;

Configure the physical random access channel PRACH, which is used to carry the data of the random access channel RACH;

Configure the downlink pilot channel DwPCH for downlink synchronization;

Configure the uplink pilot channel UpPCH for uplink synchronization;

Configure the paging indication channel PICH, which is used to carry paging indication information, and is used in pair with the paging channel PCH;

Configuring the physical uplink shared channel PUSCH for carrying the data of the uplink shared channel USCH; and

The physical downlink shared channel PDSCH is configured to bear the data of the downlink shared channel DSCH.

The above-mentioned multi-carrier-based common physical channel allocation method is characterized in that the primary common control physical channel P-CCPCH includes a first primary common control physical channel P-CCPCH1 and a second primary common control physical channel P-CCPCH2, which The specific configuration steps are as follows:

The main common control physical channel P-CCPCH is fixedly configured on the first two code channels of the time slot TS0 of the first main carrier;

The channelization codes of the first primary common control physical channel P-CCPCH1 and the second primary common control physical channel P-CCPCH2 are respectively c _Q=16 ^(k=1) and c _Q=16 ^(k=2) ;

The training sequences in the time slot TS0 of the first main carrier are m ⁽¹⁾ and m ⁽²⁾ , which are allocated to the common control physical channel P-CCPCH to support transmission diversity and beacon functions;

Adopt fixed spread spectrum method with spreading factor SF=16;

Full cell coverage mode without beamforming.

The above-mentioned multi-carrier-based common physical channel allocation method is characterized in that the specific configuration steps of the secondary common control physical channel S-CCPCH are as follows:

The secondary common control physical channel S-CCPCH is configured on the time slot TS0 of the first main carrier or the second main carrier;

Adopt fixed spread spectrum method with spreading factor SF=16;

The code word used by the secondary common control physical channel S-CCPCH is broadcast in the broadcast channel BCH;

Full cell coverage mode without beamforming.

The above-mentioned multi-carrier-based common physical channel allocation method is characterized in that the fast physical access channel FPACH is used as the response of the base station Node B to the detected uplink pilot time slot UpPTS signal of the user terminal UE, and does not carry the transport channel Information, there is no mapping relationship with the transmission channel, and its content includes synchronization adjustment, power adjustment, etc. It is a single burst information, and its specific configuration is as follows:

The fast physical access channel FPACH is configured on the first primary carrier and/or the second primary carrier;

Adopt fixed spread spectrum method with spreading factor SF=16;

The spreading code, training sequence and time slot position adopted by the fast physical access channel FPACH are configured by the network and broadcast in the broadcast channel BCH;

Beamforming may be employed.

The above-mentioned multi-carrier-based public physical channel allocation method is characterized in that the specific configuration of the physical random access channel PRACH is as follows:

The physical random access channel PRACH is configured on the first primary carrier and/or the second primary carrier;

The spreading factor SF can choose the spreading method of SF=16, 8, 4;

The configuration of the physical random access channel PRACH is broadcast in the broadcast channel BCH;

The above-mentioned multi-carrier-based common physical channel allocation method is characterized in that the position and content of the downlink pilot channel DwPCH are the same as the downlink pilot time slot DwPTS, and its burst structure includes a guard interval of 32 chips and a guard interval of 64 chips. The downlink synchronous SYNC_DL code of 1 chip, described downlink synchronous SYNC_DL code is a group of pseudo-random noise sequence, is used for distinguishing adjacent cells, and specific configuration is as follows:

The downlink pilot channel DwPCH is fixedly configured on the first main carrier;

The downlink synchronous SYNC_DL code is not spread and scrambled;

The transmit power remains unchanged and is configured by the upper layer;

Full cell coverage mode without beamforming.

The above method for allocating public physical channels based on multiple carriers is characterized in that the position and content of the uplink pilot channel UpPCH are the same as the uplink pilot time slot UpPTS. Its burst structure includes an uplink synchronous SYNC_UL code of 128 chips and a guard interval of 32 chips. The uplink synchronous SYNC_UL code is a set of pseudo-random noise sequences used to distinguish different user terminals during random access UE, the specific configuration is as follows:

The uplink pilot channel UpPCH is configured on the first primary carrier and/or the second primary carrier;

The uplink synchronization SYNC_UL code is not spread and scrambled.

The above-mentioned multi-carrier-based common physical channel allocation method is characterized in that the specific configuration of the paging indicator channel PICH is as follows:

The paging indication channel PICH is configured on the first primary carrier or the second primary carrier;

The fixed spreading method with spreading factor SF=16 is adopted.

The above-mentioned multi-carrier-based public physical channel allocation method is characterized in that the specific configuration of the physical uplink shared channel PUSCH is as follows:

The physical uplink shared channel PUSCH is configured on the first primary carrier or the second primary carrier;

Spreading factor SF can choose SF=1, 2, 4, 8, 16 spreading methods.

The above-mentioned multi-carrier-based public physical channel allocation method is characterized in that the specific configuration of the physical downlink shared channel PDSCH is as follows:

The physical downlink shared channel PDSCH is configured on the first primary carrier or the second primary carrier;

Spreading factor SF can choose SF=1, 16 spreading method.

The above method for allocating public physical channels based on multiple carriers is characterized in that, if the number of carriers in the cell/sector is N=1, only the first main carrier exists, and the public physical channels are all configured on the first primary carrier. on the primary carrier; if N=2, only the first primary carrier and the second primary carrier exist, and the common physical channel can be configured on the first primary carrier and the second primary carrier; if N≥3, then both There is a first primary carrier, a second primary carrier, and a secondary carrier, and the common physical channel can be configured on the first primary carrier and the second primary carrier.

The above-mentioned multi-carrier-based common physical channel allocation method is characterized in that if the number of carriers in the cell/sector is N≥3, then there are first main carrier, second main carrier and auxiliary carrier at the same time, wherein the auxiliary carrier The processing method is as follows:

If N=3, the only secondary carrier can be used as the backup secondary carrier of the first primary carrier or the second primary carrier, and the backup secondary carrier on the backup secondary carrier corresponds to the common physical channel configured by the first primary carrier and the second primary carrier Resources such as code channels and time slots will be reserved, and the remaining code channel and time slot resources on the backup secondary carrier can be used for dedicated physical channels; and, when the signal processing channel corresponding to the first main carrier or the second main carrier fails , the common physical channel configured on the first primary carrier or the second primary carrier can be successfully configured to the corresponding position on the backup secondary carrier, and the backup secondary carrier will be replaced by the first primary carrier or the second primary carrier;

If N≥4, there are two or more secondary carriers, and except for one secondary carrier as a backup secondary carrier, the remaining secondary carriers can be used for dedicated physical channels.

The above-mentioned multi-carrier-based public physical channel allocation method is characterized in that the carrier configuration and service configuration also meet the following conditions:

Between different adjacent cells/sectors, configure the frequencies of the first primary carrier and the second primary carrier to be different;

The frequency point configuration of the backup secondary carrier is different between different adjacent cells/sectors;

The multi-slot service of the same user is configured on the same carrier;

The uplink and downlink services of the same user are configured on the same carrier;

The uplink pilot channel, the fast physical random channel, and the physical random access channel are configured on the same carrier, either only on the first main carrier, or both on the first main carrier and the second main carrier. configure.

The above multi-carrier based common physical channel allocation method is characterized in that the secondary common control physical channel S-CCPCH and the paging indication channel PICH are configured on the same carrier.

The above method for allocating public physical channels based on multiple carriers is characterized in that when N=1, the uplink pilot channel UpPCH, fast physical random channel FPACH, and physical random access channel PRACH are only configured in the first On the main carrier; when N≥2, the first main carrier and the second main carrier exist at the same time, and because the frequency points configured by the first main carrier and the second main carrier are different, the uplink pilot channel UpPCH, fast physical The random channel FPACH and the physical random access channel PRACH may be configured only on the first primary carrier, or may be configured on both the first primary carrier and the second primary carrier.

Combining the characteristics of the TD-SCDMA communication system, the present invention provides a multi-carrier-based public physical channel allocation method, which improves system reliability, system capacity and system efficiency, and increases cell/sector coverage and cell search rate, reducing the complexity of UE measurement and cell handover.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

Fig. 1 is the physical channel signal format of the TD-SCDMA communication system of the present invention;

Fig. 2 is the subframe structure of the TD-SCDMA communication system of the present invention.

Detailed ways

By referring to the detailed description of the specific embodiments of the present invention with reference to the accompanying drawings, the purpose, technical solutions and advantages of the present invention will be clearer and easier to understand.

As shown in Figures 1 and 2, a wireless frame of TD-SCDMA is 10ms long and is divided into two 5ms subframes with identical structures. Each subframe is divided into 7 regular time slots and 3 special time slots, the 3 special time slots are downlink pilot time slot DwPTS, main guard time slot GP and uplink pilot time slot UpPTS. Of the 7 regular time slots, TS0 is always allocated to the downlink and TS1 is always allocated to the uplink. Uplink time slots and downlink time slots are separated by switching points. In the TD-SCDMA communication system, each subframe includes 2 switching points. By flexibly configuring the number of uplink and downlink time slots, TD-SCDMA is suitable for uplink and downlink symmetric and asymmetric business modes.

For the area covered by multiple carriers, for each cell/sector, one of the assigned N carriers is determined as the first primary carrier, another carrier is determined as the second primary carrier, and the rest are used as secondary carriers.

If the number of carriers in the cell/sector is N=1, only the first primary carrier exists; if N=2, only the first primary carrier and the second primary carrier exist; if N≥3, there is both the first The primary carrier, the second primary carrier, and secondary carriers also exist.

For a multi-carrier based communication system, the number N of carriers in a cell/sector usually satisfies N≧3.

If N=3, the only secondary carrier can be used as a backup carrier for the first primary carrier or the second primary carrier, which is called a backup secondary carrier. The code channels, time slots and other resources corresponding to the common physical channels configured on the first primary carrier and the second primary carrier on the backup secondary carrier will be reserved, and the remaining code channel and time slot resources on the backup secondary carrier can be used for dedicated physical channels. When the signal processing channel corresponding to the first primary carrier or the second primary carrier fails, the common physical channel configured on the first primary carrier or the second primary carrier can be successfully configured to the corresponding position on the backup secondary carrier, that is, the backup The secondary carrier will instead be the primary primary carrier or the secondary primary carrier.

If N≥4, there are two or more secondary carriers, and except for one secondary carrier as a backup secondary carrier, the remaining secondary carriers can be used for dedicated physical channels.

The frequency point configurations of the first main carrier, the second main carrier and the backup auxiliary carrier are different among different neighboring cells/sectors.

The method of the present invention is described below by taking the case that the Node B/UE has the capability of processing one carrier, two carriers, and multiple (three or more) carriers as examples, but this is not a limitation of the present invention.

Embodiment 1, for the case where the Node B/UE only has the ability to process one carrier:

Since the Node B/UE can only process one carrier at the same time, the common physical channels are configured on the first primary carrier.

For P-CCPCH, its configuration method is as follows:

1) P-CCPCH is configured on the first two code channels of TS0 of the first main carrier;

2) The channelization codes of P-CCPCH1 and P-CCPCH2 are c _Q=16 ^(k=1) and c _Q=16 ^(k=2) respectively;

3) Training sequences m ⁽¹⁾ and m ⁽²⁾ in TS0 are allocated to P-CCPCH to support transmit diversity and beacon functions;

4) adopt the fixed spread spectrum method of spreading factor SF=16;

5) Full cell coverage mode, without beamforming.

For S-CCPCH, its configuration method is as follows:

1) S-CCPCH is configured on TS0 of the first main carrier;

2) Adopting a fixed spread spectrum method with a spreading factor SF=16;

3) The code word used by S-CCPCH is broadcast in BCH;

4) Full cell coverage mode, without beamforming.

For FPACH, its configuration method is as follows:

1) The FPACH is configured on the first primary carrier;

2) Adopting a fixed spread spectrum method with a spreading factor SF=16;

3) The spreading code, training sequence and time slot position used by FPACH are configured by the network and broadcast in BCH;

4) Beamforming can be used.

For PRACH, its configuration method is as follows:

1) The PRACH is configured on the first primary carrier;

2) The spreading factor can choose the spreading method of SF=16, 8, 4;

3) The configuration of PRACH (time slot and spreading code used) is broadcast in BCH.

For DwPCH, its configuration method is as follows:

1) DwPCH is configured on the first primary carrier;

2) The SYNC_DL code does not spread and scramble;

3) The transmit power remains unchanged and is configured by the upper layer;

4) Full cell coverage mode, without beamforming.

For UpPCH, its configuration method is as follows:

1) UpPCH is configured on the first main carrier;

2) The SYNC_UL code does not spread spectrum and scramble.

For the paging indication channel (PICH), its configuration method is as follows:

1) The PICH is configured on the first primary carrier;

2) A fixed spreading method with spreading factor SF=16 is adopted.

For the physical uplink shared channel (PUSCH), its configuration method is as follows:

1) PUSCH is configured on the first primary carrier;

2) The spreading factor can choose the spreading method of SF=1, 2, 4, 8, 16.

For the physical downlink shared channel (PDSCH), its configuration method is as follows:

1) The PDSCH is configured on the first primary carrier;

2) The spreading factor can choose the spreading method of SF=1, 16.

Since both P-CCPCH and S-CCPCH are configured on TS0 of the first main carrier, and both adopt the full-cell coverage mode, and the dedicated physical channel usually adopts beamforming technology, this requires that the full-cell coverage mode must rely on improving the code channel Transmit power to make up for the difference in coverage between the two. Limited by the total transmit power in a time slot, the P-CCPCH and S-CCPCH cannot simultaneously multiplex the same time slot on the same carrier, but use time division to multiplex the TS0 of the first main carrier.

In this case, the TS0 on the second primary carrier and secondary carrier may not be used, or may be used as a dedicated physical channel to carry non-real-time services. When there is no BCH, PCH, and FACH data on the TS0 of the first primary carrier, the UE will It can be switched to the second main carrier or auxiliary carrier to process corresponding non-real-time service data.

Embodiment 2, for the case where the Node B/UE has the ability to process two carriers simultaneously:

Since the Node B/UE can handle two carriers at the same time, there is some flexibility in the configuration of the common physical channel.

For P-CCPCH, its configuration method is as follows:

1) P-CCPCH is configured on the first two code channels of TS0 of the first main carrier;

2) The channelization codes of P-CCPCH1 and P-CCPCH2 are c _Q=16 ^(k=1) and c _Q=16 ^(k=2) respectively;

3) Training sequences m ⁽¹⁾ and m ⁽²⁾ in TS0 are allocated to P-CCPCH to support transmit diversity and beacon functions;

4) adopt the fixed spread spectrum method of spreading factor SF=16;

5) Full cell coverage mode, without beamforming.

For S-CCPCH, its configuration method is as follows:

1) The S-CCPCH is configured on the TS0 of the first main carrier or the second main carrier;

2) Adopting a fixed spread spectrum method with a spreading factor SF=16;

3) The code word used by S-CCPCH is broadcast in BCH;

4) Full cell coverage mode, without beamforming.

For FPACH, its configuration method is as follows:

1) The FPACH configuration is configured on the first primary carrier and/or the second primary carrier;

2) Adopting a fixed spread spectrum method with a spreading factor SF=16;

3) The spreading code, training sequence and time slot position used by FPACH are configured by the network and broadcast in BCH;

4) Beamforming can be used.

For PRACH, its configuration method is as follows:

1) The PRACH is configured on the first primary carrier and/or the second primary carrier;

2) The spreading factor can choose the spreading method of SF=16, 8, 4;

3) The configuration of PRACH (time slot and spreading code used) is broadcast in BCH.

For DwPCH, its configuration method is as follows:

1) DwPCH is configured on the first primary carrier;

2) The SYNC_DL code does not spread and scramble;

3) The transmission power remains unchanged and is configured by the upper layer;

4) Full cell coverage mode, without beamforming.

For UpPCH, its configuration method is as follows:

1) The UpPCH is configured on the first primary carrier and/or the second primary carrier;

2) The SYNC_UL code does not spread spectrum and scramble.

For the paging indication channel (PICH), its configuration method is as follows:

1) The PICH is configured on the first primary carrier or the second primary carrier;

2) A fixed spreading method with spreading factor SF=16 is adopted.

For the physical uplink shared channel (PUSCH), its configuration method is as follows:

1) The PUSCH is configured on the first primary carrier or the second primary carrier;

2) The spreading factor can choose the spreading method of SF=1, 2, 4, 8, 16.

For the physical downlink shared channel (PDSCH), its configuration method is as follows:

1) The PDSCH is configured on the first primary carrier or the second primary carrier;

2) The spreading factor can choose the spreading method of SF=1, 16.

There are two configuration modes of S-CCPCH:

In the first manner, the S-CCPCH and the P-CCPCH are configured together on the TS0 of the first main carrier. In this way, the TSO of the second primary carrier can be configured as a dedicated physical channel, which is applicable to both real-time and non-real-time services. In addition, the TS0 on the secondary carrier may not be used, or it may be used as a dedicated physical channel to carry non-real-time services. When there is no BCH, PCH, and FACH data on the TS0 of the first primary carrier, the UE can switch to the secondary carrier to process the corresponding non-real-time business data.

In the second manner, the S-CCPCH is configured on the TS0 of the second primary carrier. Since the P-CCPCH and S-CCPCH are respectively configured on different carriers, the S-CCPCH and the P-CCPCH can be multiplexed together at the same time. This configuration method is especially suitable for the case of a large cell/sector capacity. In addition, the TS0 on the secondary carrier may not be used, or it may be used as a dedicated physical channel to carry non-real-time services. When there is no BCH data on the TS0 of the first primary carrier, or there is no PCH and FACH data on the TS0 of the second primary carrier, the UE It can be switched to the secondary carrier to process corresponding non-real-time service data.

Since the PICH is used to carry paging indication information and is used in pair with the paging channel (PCH), it is recommended that the PICH and the S-CCPCH be configured on the same carrier.

Since the UpPCH, FPACH and PRACH are closely related to the random access process of the UE, it is recommended that the UpPCH, FPACH and PRACH be configured on the same carrier.

According to the current TD-SCDMA standard, there are 32 code groups in total, and each code group only includes 8 SYNC_UL codes. It is easy to have access conflict or difficult access. One way to address access difficulties is as follows:

Since Node B/UE has the ability to process two carriers at the same time, and the frequency points configured by the first main carrier and the second main carrier are different, so 8 SYNC_UL codes in a certain code group can be allocated on the first main carrier, while The same 8 SYNC_UL codes are also allocated on the second primary carrier, which will definitely improve the success probability of random access (synchronization detection probability). After the Node B successfully detects the SYNC_UL code sent by the UE, it will send a confirmation message to the UE on the FPACH of the corresponding carrier (the first primary carrier or the second primary carrier), and then the UE can send a message on the corresponding carrier (the first primary carrier or the second primary carrier). The access information is sent to the Node B on the PRACH of the second primary carrier, and finally the Node B sends the necessary information to the UE, and the call establishment is completed. That is, both the first main carrier and the second main carrier are configured with UpPCH, FPACH and PRACH.

Embodiment 3, for the situation that the Node B/UE has the ability to simultaneously process multiple (three or more) carriers:

Although the Node B/UE can process three or more carriers at the same time, the common physical channel configuration is still the same as the Node B/UE has the ability to process two carriers at the same time.

For P-CCPCH, its configuration method is as follows:

1) P-CCPCH is configured on the first two code channels of TS0 of the first main carrier;

2) The channelization codes of P-CCPCH1 and P-CCPCH2 are c _Q=16 ^(k=1) and c _Q=16 ^(k=2) respectively;

3) Training sequences m ⁽¹⁾ and m ⁽²⁾ in TS0 are allocated to P-CCPCH to support transmit diversity and beacon functions;

4) adopt the fixed spread spectrum method of spreading factor SF=16;

5) Full cell coverage mode, without beamforming.

For S-CCPCH, its configuration method is as follows:

1) The S-CCPCH is configured on the TS0 of the first main carrier or the second main carrier;

2) Adopting a fixed spread spectrum method with a spreading factor SF=16;

3) The code word used by S-CCPCH is broadcast in BCH;

4) Full cell coverage mode, without beamforming.

For FPACH, its configuration method is as follows:

1) The FPACH configuration is configured on the first primary carrier and/or the second primary carrier;

2) Adopting a fixed spread spectrum method with a spreading factor SF=16;

3) The spreading code, training sequence and time slot position used by FPACH are configured by the network and broadcast in BCH;

4) Beamforming can be used.

For PRACH, its configuration is as follows:

1) The PRACH is configured on the first primary carrier and/or the second primary carrier;

2) The spreading factor can choose the spreading method of SF=16, 8, 4;

3) The configuration of PRACH (time slot and spreading code used) is broadcast in BCH.

For DwPCH, its configuration is as follows:

1) DwPCH is configured on the first primary carrier;

2) The SYNC_DL code does not spread and scramble;

3) The transmission power remains unchanged and is configured by the upper layer;

4) Full cell coverage mode, without beamforming.

For UpPCH, its configuration method is as follows:

1) The UpPCH is configured on the first primary carrier and/or the second primary carrier;

2) The SYNC_UL code does not spread spectrum and scramble.

For the paging indication channel (PICH), its configuration method is as follows:

1) PICH is configured on the first primary carrier or the second primary carrier

2) Fixed spread spectrum method with spreading factor SF=16

For the physical uplink shared channel (PUSCH), its configuration method is as follows:

1) The PUSCH is configured on the first primary carrier or the second primary carrier;

2) The spreading factor can choose the spreading method of SF=1, 2, 4, 8, 16.

For the physical downlink shared channel (PDSCH), its configuration method is as follows:

1) The PDSCH is configured on the first primary carrier or the second primary carrier;

2) The spreading factor can choose the spreading method of SF=1, 16.

There are two configuration modes of S-CCPCH:

In the first manner, the S-CCPCH and the P-CCPCH are configured together on the TS0 of the first main carrier. In this way, the TSO of the second primary carrier can be configured as a dedicated physical channel, which is applicable to both real-time and non-real-time services. In addition, the remaining carrier processing capacity of Node B/UE can be allocated to auxiliary carriers (including M-2 auxiliary carriers at most, the number of carriers that Node B/UE can handle at the same time), and the TS0 corresponding to auxiliary carriers can be configured as a dedicated physical channel. Applicable to real-time business and non-real-time business. Except for the above M-2 secondary carriers, the TS0 on the other secondary carriers may not be used, or may be used as a dedicated physical channel to carry non-real-time services. When there is no BCH, PCH, and FACH data on the TS0 of the first primary carrier, the UE It can then be switched to these auxiliary carriers to process corresponding non-real-time service data.

In the second manner, the S-CCPCH is configured on the TS0 of the second main carrier. Since the P-CCPCH and S-CCPCH are respectively configured on different carriers, the S-CCPCH and the P-CCPCH can be multiplexed together at the same time. This configuration method is especially suitable for the case of a large cell/sector capacity. In addition, the remaining carrier processing capacity of NodeB/UE can be allocated to auxiliary carriers (including M-2 auxiliary carriers at most, M is the number of carriers that Node B/UE can handle at the same time), and the TS0 corresponding to auxiliary carriers can be configured as a dedicated physical channel. It is also applicable to real-time business and non-real-time business. Except for the above M-2 secondary carriers, the TS0 on the other secondary carriers may not be used, or may be used as a dedicated physical channel to carry non-real-time services. When there is no BCH data on the TS0 of the first primary carrier, or the TS0 of the second primary carrier When there is no PCH and FACH data on TS0, the UE can switch to these secondary carriers to process corresponding non-real-time service data.

Since the PICH is used to carry paging indication information and is used in pair with the paging channel (PCH), it is recommended that the PICH and the S-CCPCH be configured on the same carrier.

Since the UpPCH, FPACH and PRACH are closely related to the random access process of the UE, it is recommended that the UpPCH, FPACH and PRACH be configured on the same carrier.

Since the Node B/UE has the ability to process multiple carriers at the same time, and the frequency points configured by the first main carrier and the second main carrier are different, so 8 SYNC_UL codes in a certain code group can be allocated on the first main carrier, And the same 8 SYNC_UL codes are also allocated on the second main carrier, which will definitely improve the success probability of random access (synchronization detection probability). After the Node B successfully detects the SYNC_UL code sent by the UE, it will send a confirmation message to the UE on the FPACH of the corresponding carrier (the first primary carrier or the second primary carrier), and then the UE can send a message on the corresponding carrier (the first primary carrier or the second primary carrier). The access information is sent to the Node B on the PRACH of the second primary carrier, and finally the Node B sends the necessary information to the UE, and the call establishment is completed. That is, both the first main carrier and the second main carrier are configured with UpPCH, FPACH and PRACH.

The present invention overcomes the problems of coverage, system capacity and reliability of the TD-SCDMA communication system based on multi-carriers, and provides a public physical channel allocation scheme based on multi-carriers, which improves system reliability, system capacity and reliability. System efficiency increases cell/sector coverage and cell search rate, and reduces the complexity of UE measurement and cell handover. When adopting the common physical channel allocation scheme described in the present invention in the specific implementation and realization process, multiple factors such as Node B/UE multi-carrier processing capability, cell/sector coverage, cell/sector capacity, and network planning should be considered comprehensively.

The present invention is applicable to the TD-SCDMA communication system (1.28McpsLCR TDD) in the third generation mobile communication system, but is equally applicable to 3.84Mcps TDD system and adopts the system of frequency division multiple access and time division multiple access of synchronous CDMA, any have Engineers with knowledge backgrounds such as signal processing and communication can design corresponding synchronous detection methods and devices according to the present invention, which should be included in the idea and scope of the present invention.

Of course, the present invention can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present invention without departing from the spirit and essence of the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (16)

1, a kind of public physical channel allocation method based on multi-carrier, is characterized in that, comprises the steps: For the area covered by multiple carriers, for each cell/sector, one carrier is determined from the assigned N carriers as the first primary carrier, another carrier is determined as the second primary carrier, and the remaining carriers are used as secondary carriers. The carrier can be used as a backup auxiliary carrier for the first primary carrier or the second primary carrier; In the same cell/sector, the first main carrier, the second main carrier and the auxiliary carrier use the same scrambling code and basic training sequence; Configuring the common physical channel on the first primary carrier or the second primary carrier. 2. The multi-carrier-based public physical channel allocation method according to claim 1, wherein the step of configuring the public physical channel may include the following steps: Configure the primary common control physical channel P-CCPCH, which is used to carry the data of the broadcast channel BCH, and provide system information broadcast in the whole cell coverage mode; Configure the Secondary Common Control Physical Channel S-CCPCH to carry the data of the Paging Channel PCH and the Forward Access Channel FACH; Configure the fast physical random access channel FPACH to support the establishment of uplink synchronization; Configure the physical random access channel PRACH, which is used to carry the data of the random access channel RACH; Configure the downlink pilot channel DwPCH for downlink synchronization; Configure the uplink pilot channel UpPCH for uplink synchronization; Configure the paging indication channel PICH, which is used to carry paging indication information, and is used in pair with the paging channel PCH; Configuring the physical uplink shared channel PUSCH for carrying the data of the uplink shared channel USCH; and The physical downlink shared channel PDSCH is configured to bear the data of the downlink shared channel DSCH. 3. The method for allocating common physical channels based on multiple carriers according to claim 2, wherein the primary common control physical channel P-CCPCH comprises a first primary common control physical channel P-CCPCH1 and a second primary common control physical channel P-CCPCH1. Physical channel P-CCPCH2, the specific configuration steps are as follows: The main common control physical channel P-CCPCH is fixedly configured on the first two code channels of the time slot TS0 of the first main carrier; The channelization codes of the first primary common control physical channel P-CCPCH1 and the second primary common control physical channel P-CCPCH2 are respectively c _Q=16 ^(k=1) and c _Q=16 ^(k=2) ; The training sequences in the time slot TS0 of the first main carrier are m ⁽¹⁾ and m ⁽²⁾ , which are allocated to the common control physical channel P-CCPCH to support transmission diversity and beacon functions; Adopt fixed spread spectrum method with spreading factor SF=16; Full cell coverage mode without beamforming. 4. The multi-carrier-based common physical channel allocation method according to claim 2, wherein the specific configuration steps of the secondary common control physical channel S-CCPCH are as follows: The secondary common control physical channel S-CCPCH is configured on the time slot TS0 of the first main carrier or the second main carrier; Adopt fixed spread spectrum method with spreading factor SF=16; The code word used by the secondary common control physical channel S-CCPCH is broadcast in the broadcast channel BCH; Full cell coverage mode without beamforming. 5. The multi-carrier-based public physical channel allocation method according to claim 2, wherein the Fast Physical Access Channel (FPACH) is used as the uplink pilot time slot UpPTS signal of the detected user terminal UE by the base station Node B The response does not carry transmission channel information, and there is no mapping relationship with the transmission channel. Its content includes synchronization adjustment, power adjustment, etc. It is a single burst information. The specific configuration is as follows: The fast physical access channel FPACH is configured on the first primary carrier and/or the second primary carrier; Adopt fixed spread spectrum method with spreading factor SF=16; The spreading code, training sequence and time slot position adopted by the fast physical access channel FPACH are configured by the network and broadcast in the broadcast channel BCH; Beamforming may be employed. 6. The multi-carrier-based public physical channel allocation method according to claim 2, wherein the physical random access channel (PRACH) is specifically configured as follows: The physical random access channel PRACH is configured on the first primary carrier and/or the second primary carrier; The spreading factor SF can choose the spreading method of SF=16, 8, 4; The configuration of the physical random access channel PRACH is broadcast in the broadcast channel BCH; 7. The method for allocating public physical channels based on multiple carriers according to claim 2, wherein the position and content of the downlink pilot channel DwPCH are the same as those of the downlink pilot time slot DwPTS, and its burst structure includes 32 The guard interval of the chip and the downlink synchronous SYNC_DL code of 64 chips, the downlink synchronous SYNC_DL code is a group of pseudorandom noise sequences for distinguishing adjacent cells, and the specific configuration is as follows: The downlink pilot channel DwPCH is fixedly configured on the first main carrier; The downlink synchronous SYNC_DL code is not spread and scrambled; The transmit power remains unchanged and is configured by the upper layer; Full cell coverage mode without beamforming. 8. The method for allocating public physical channels based on multiple carriers according to claim 2, wherein the position and content of the uplink pilot channel UpPCH are the same as those of the uplink pilot time slot UpPTS. Its burst structure includes an uplink synchronous SYNC_UL code of 128 chips and a guard interval of 32 chips. The uplink synchronous SYNC_UL code is a set of pseudo-random noise sequences used to distinguish different user terminals during random access UE, the specific configuration is as follows: The uplink pilot channel UpPCH is configured on the first primary carrier and/or the second primary carrier; The uplink synchronization SYNC_UL code is not spread and scrambled. 9. The multi-carrier-based public physical channel allocation method according to claim 2, wherein the paging indicator channel PICH is specifically configured as follows: The paging indication channel PICH is configured on the first primary carrier or the second primary carrier; The fixed spreading method with spreading factor SF=16 is adopted. 10. The multi-carrier-based public physical channel allocation method according to claim 2, wherein the physical uplink shared channel PUSCH is specifically configured as follows: The physical uplink shared channel PUSCH is configured on the first primary carrier or the second primary carrier; Spreading factor SF can choose SF=1, 2, 4, 8, 16 spreading methods. 11. The multi-carrier-based public physical channel allocation method according to claim 2, wherein the specific configuration of the physical downlink shared channel (PDSCH) is as follows: The physical downlink shared channel PDSCH is configured on the first primary carrier or the second primary carrier; Spreading factor SF can choose SF=1, 16 spreading method. 12. The multi-carrier-based public physical channel allocation method according to any one of the preceding claims, characterized in that, if the number of carriers in the cell/sector is N=1, only the first main carrier exists, so The common physical channels are all configured on the first main carrier; if N=2, there are only the first main carrier and the second main carrier, and the common physical channels can be configured on the first main carrier, the second main carrier On the primary carrier; if N≥3, there are both the first primary carrier, the second primary carrier, and the secondary carrier, and the common physical channel can be configured on the first primary carrier and the second primary carrier. 13. The multi-carrier-based public physical channel allocation method according to claim 12, characterized in that, if the number of carriers in the cell/sector is N≥3, then the first main carrier, the second main carrier and the auxiliary Carrier, wherein the processing method of the auxiliary carrier is as follows: If N=3, the only secondary carrier can be used as the backup secondary carrier of the first primary carrier or the second primary carrier, and the backup secondary carrier on the backup secondary carrier corresponds to the common physical channel configured by the first primary carrier and the second primary carrier Resources such as code channels and time slots will be reserved, and the remaining code channel and time slot resources on the backup secondary carrier can be used for dedicated physical channels; and, when the signal processing channel corresponding to the first main carrier or the second main carrier fails , the common physical channel configured on the first primary carrier or the second primary carrier can be successfully configured to the corresponding position on the backup secondary carrier, and the backup secondary carrier will be replaced by the first primary carrier or the second primary carrier; If N≥4, there are two or more secondary carriers, and except for one secondary carrier as a backup secondary carrier, the remaining secondary carriers can be used for dedicated physical channels. 14. The multi-carrier-based public physical channel allocation method according to claim 12, wherein the carrier configuration and service configuration also meet the following conditions: Between different adjacent cells/sectors, configure the frequencies of the first primary carrier and the second primary carrier to be different; The frequency point configuration of the backup secondary carrier is different between different adjacent cells/sectors; The multi-slot service of the same user is configured on the same carrier; The uplink and downlink services of the same user are configured on the same carrier; The uplink pilot channel UpPCH, fast physical random channel FPACH, and physical random access channel PRACH are configured on the same carrier, either only on the first main carrier, or on the first main carrier and the second main carrier Both are configured on the carrier. 15. The method for allocating common physical channels based on multiple carriers according to claim 12, wherein the secondary common control physical channel S-CCPCH and the paging indication channel PICH are configured on the same carrier. 16. The multi-carrier-based public physical channel allocation method according to claim 14, wherein when N=1, the uplink pilot channel UpPCH, fast physical random channel FPACH, and physical random access channel PRACH It is only configured on the first main carrier; when N≥2, the first main carrier and the second main carrier exist at the same time, and since the frequency points configured by the first main carrier and the second main carrier are different, the uplink The pilot channel UpPCH, the fast physical random channel FPACH, and the physical random access channel PRACH may be configured only on the first main carrier, or may be configured on both the first main carrier and the second main carrier.

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