WO2009009946A1 - Method for realizing improving multimedia broadcast multicast service in multi-carrier cell - Google Patents

Abstract

A method for realizing enhancing MBMS service in multi-carrier cell, includes: that downstream time slot is divided into MBSFN time slot and Non-MBSFN time slot in multi-carrier cell; the same part of MBMS service in each cell is configured to the MBSFN time slot, the peculiar part of MBMS service in each cell is configured to the Non-MBSFN time slot; the configuration information is sent to the UEs of in the total multi-carrier cell, the UEs receive the MBMS service according to the configuration information.

Description

 Method for realizing enhanced service multimedia broadcast multicast in multi-carrier cell

Technical field

 The present invention relates to the field of wireless communications, and more particularly to implementing enhanced multimedia broadcast and multicast in a multi-frequency point cell in a Time Division Code Synchronization Division Multiple Access (TD-SCDMA) system. The method of MBMS (Multimedia Broadcast Multicast Service).

Background technique

 With the popularity of large-screen multi-function mobile phones, the application of mobile data services is more and more extensive, and the demand for mobile communication is no longer satisfied with the telephone, message and mobile Internet browsing services. In order to effectively utilize mobile network resources, 3GPP has proposed Multimedia Broadcast Multicast Service (MBMS) provides a point-to-multipoint service in which data sources send data to multiple users in a mobile network, realizes network resource sharing, and improves network resource utilization, especially Valuable air interface resources. The MBMS service is a technology for sharing network resources to transfer data from one data source to multiple targets. The MBMS defined by MBS can not only realize plain text low-rate message class multicast and broadcast, but also realize high-speed multimedia service multicast. And broadcast, offering a wide variety of rich video, audio and multimedia services. MBMS services include: Multicast Service and Broadcast Service. Each multicast service requires a joining process. The user terminal (UE) needs to activate a multicast service to the BM-SC (Broadcast-Multicast Service Centre), and for each broadcast service, The UE only needs local activation. In the configuration of the radio bearer, the multicast service can adopt the bearer type of PTM (point-to-multipoint, but also abbreviated PTM or ptm) and PTP (point-to-point, also abbreviated PTP or ptp), and the broadcast service can only be used. Use PTM.

 The MBSFN (MBMS Single Frequency Network) technology is an enhanced MBMS technology. Referring to the enhanced MBMS technology, all neighboring base stations simultaneously transmit the same wireless signal. See Figure 1. In MBSFN mode, the UE can come from Signals from different base stations are considered multipath signals, and MBSFN greatly improves spectrum utilization.

For the TD-SCDMA system, the MBMS service mode is characterized by services in many scenarios. There is no terminal uplink feedback signal in progress, and the smart antenna is no longer suitable for the MBMS service mode. Therefore, the MBSFN technology is very beneficial for improving the gain and reducing interference of the MBMS service in the TD-SCDMA system.

 In the MBSFN time slot, the base stations of each cell transmit the same MBMS data content with the same frequency, the same scrambling code, and the same midamble (intermediate code) code, so that the UE can receive the same content from multiple cells as received. As with the multipath of a cell, the gain of the UE receiving the MBMS service can be improved. In the MBSFN time slot, the MBMS service is only carried in the P-T-M mode. In addition to other MBMS-bearing channels carrying MBMSN time slots, the downlink time slots including MCCH (MBMS Control Channel), MICH (MBMS Indicator Channel) or MTCH (MBMS Traffic Channel) are Non-MBSFN time slots, in Non-MBSFN time slots. The base station of each cell does not require the same frequency, the same scrambling code, and the same midamble code to transmit the same MBMS data content, so the MBMS service content received by the UE on the Non-MBMS time slot does not obtain additional gain.

 For some MBMS services, such as: mobile TV, when the TV channels of each cell are the same, they can be sent on the MBSFN time slot, so that each cell sends the same TV channel on the MBSFN time slot, and the UE receives the TV channel. Good gain can be obtained for the signal; for the MCCH channel and MICH of the MBMS, and some MBMS services (such as information specific to each cell, cell service information, etc.) carried on the MTCH, due to the MCCH of each cell, The contents of the MICH and part of the MTCH (the program specific to the cell) are different. These MBSM channels are transmitted on the Non-MBSFN time slot, and the UE cannot obtain the gain when receiving these channels.

 In the TD-SCDMA system, the enhanced MBMS technology is introduced, that is, the downlink time slot of one radio frame is divided into MBSFN time slot and Non-MBSFN time slot, which can improve the gain of the UE receiving the MBMS service.

At present, the TD-SCDMA system in the 3GPP protocol is a single carrier system, that is, one cell corresponds to one carrier, and the spectrum width of a single carrier is 1.6M. Since TD-SCDMA uses a relatively narrowband TDD (Time Division Duplex) mode, on a single carrier. The theoretical peak rate is 2.8 Mbps, and some technical improvements are made at the base of a single carrier cell, namely: In a TD-SCDMA cell, there are multiple carriers, so that the spectrum width of each cell is N*1.6M (N is per The number of carriers in each cell) can meet the higher requirements of operators for downlink packet data services. The MBMS service needs to occupy a large amount of spectrum resources. If the MBMS is carried in a single-frequency cell, that is, a single-carrier cell, it will inevitably affect the normal operation of the normal service. For example, if the MBMS service is carried in a multi-frequency cell, The carrier cell, because the spectrum resources of the cell are relatively rich, will not affect the normal service.

 At present, in order to cover the entire cell, the power of the broadcast channel (BCH) including the cell can be covered.

The BCH is carried on TS0 (fixed downlink time slot) of the primary carrier, and the other carriers of TS0 have no transmission power, that is, the total transmission power of each carrier of TS0 is concentrated on the primary carrier.

 In the prior art, there is no method of carrying MBMS services in a multi-carrier cell. Summary of the invention

 It is an object of the present invention to provide a method of implementing enhanced MBMS services in a multi-carrier cell. The technical solution adopted by the invention is:

 A method for implementing an enhanced MBMS service in a multi-carrier cell includes:

 a. In the multi-carrier cell, the downlink time slot is divided into an MBSFN time slot and a Non-MBSFN time slot; the same part of the MBMS service of each cell is configured to the MBSFN time slot; and the part of the MBMS service unique to each cell is configured to On the Non-MBSFN time slot;

 b. Send the configuration information to the user terminal in the entire multi-carrier cell;

 c. The user terminal receives the MBMS service.

 Further, in the step a:

 Configuring the MBMS control channel, the MBMS indicator channel, and the cell-specific part of the MBMS traffic channel to one or more Non-MBSFN time slots; and configuring the same part of the MBMS service channel of each cell to one or more MBSFN time slots .

 Further, in the step a:

 Only one MBMS control channel and one MBMS indication channel are configured in each multi-carrier cell, and one or more MBMS service channels are configured.

 Further, in the step a:

The MBMS control channel, the MBMS indicator channel, and the part of the MBMS service unique to the cell The channel is configured on a primary carrier of one or more Non-MBSFN slots;

 The same part of the MBMS traffic channel of each cell is configured to one or more MBSFN time slots of the primary carrier or a certain secondary carrier; the same MBMS traffic channel allocated by each cell to the MBSFN time slot should be the same carrier as other cells.

 Further, in the step a:

 The transmit power of all carriers of the one or more Non-MBSFN slots is concentrated to transmit on the primary carrier;

 The transmit power of all carriers of the one or more MBSFN slots is concentrated on one carrier for transmission.

 Further, in the step b, the radio network controller sends the configured MBSFN time slot, the Non-MBSFN time slot, and the MBMS channel information to the user terminal in the entire multi-carrier cell by using the system broadcast message.

 Further, in the step b, the radio network controller configures a new information unit in the system broadcast message, notifying the user terminal that one or more MBSFN slots are configured in the downlink time slot of the cell; and notifying the user terminal of the MBSFN Which downlink time slot is the slot, on which carrier the MBMS service is carried, and the current cell parameter identifier.

 Further, in the step b, the radio network controller sends the configured MBSFN time slot, the Non-MBSFN time slot, and the MBMS channel information to the user terminal in the entire multi-carrier cell by using a higher layer command.

 Further, in the step b, the radio network controller passes the radio resource control message or

The control information carried on the MBMS control channel informs the user terminal whether the MBSFN time slot is configured in the local cell, and which downlink time slot these MBSFN time slots are, on which carrier the MBMS service and the current cell parameter identifier are carried.

 Further, the step c is specifically:

 The user terminal is configured according to the MBMS control channel and/or the MBMS indication channel configuration information.

The primary carrier of the Non-MBSFN time slot receives the MBMS control channel and/or the MBMS indication channel; when the user terminal wants to receive the MBMS service carried on the MBSFN time slot, the information of the MBMS service channel is read according to the configuration information, and Path merge improves receiver gain; when the user When the terminal receives the MBMS service carried on the Non-MBSFN time slot, it receives the information of the MBMS service channel on the primary carrier.

The method of the technical solution of the present invention fully combines the characteristics of the single-frequency network and the multi-carrier cell, classifies the service according to the characteristics of the multimedia broadcast multicast service, and allocates the MBSFN time slot for each multi-carrier cell common service, and each On the multi-carrier cell-specific service Non-MBSFN time slot, the terminal 4 performs service reception from the corresponding time slot according to the corresponding configuration information. On the one hand, the single-frequency time slot is utilized for the common service, and each cell uses the same frequency, the same scrambling code, and the same midamble (intermediate code) code to transmit the same MBMS data content, so that the UE can receive multiple received data. The same content of the cell is regarded as the multipath of one cell, which can improve the gain of the UE receiving the common MBMS service. On the other hand, other personalized services are carried on multiple carrier frequencies, and the spectrum resources of the cells are relatively rich, which does not affect ordinary services.

 Further, the transmit power of all carriers of one or more Non-MBSFN slots is also concentrated to transmit on the primary carrier; the transmit powers of all carriers of one or more MBSFN slots are concentrated to one carrier for transmission. To enhance the reception of MBMS services. In addition, after adopting the method of the present invention, the MBMS service of the same part for each cell can improve the receiving gain of the user terminal by multipath combining. BRIEF abstract

 1 is a schematic diagram of an MBMS enhancement technique in the prior art;

 2 is a flowchart of a method for implementing an enhanced MBMS service in a multi-carrier cell according to the present invention; FIG. 3 is a specific implementation diagram of a method for implementing an enhanced MBMS service in a multi-carrier cell according to the present invention;

 4 is a schematic diagram of another specific implementation of a method for implementing an enhanced MBMS service in a multi-carrier cell according to the present invention.

Preferred embodiment of the invention

The technical solution of the present invention will be described in more detail below with reference to the accompanying drawings and embodiments. The present invention is to explain how to carry the enhanced MBMS technology in a multi-frequency cell, that is, how to implement the function of enhancing the MBMS technology in the multi-frequency cell of the TD-SCDMA system. The invention realizes an enhanced MBMS service in a multi-frequency point cell based on the existing multi-frequency point labeling, such as: a mobile TV service (an MBMS service, characterized in that multiple cells send the same TV) Channel). Specifically, as shown in FIG. 2, first, since the TD-SCDMA system can perform time division multiplexing on one carrier, the downlink time slot carrying the MBMS service channel can be further divided into MBSFN time slots and Non-MBSFN time slots; UTRAN

The MBSFN time slot is configured in (Node B) so that the mobile TV service can be carried on the MBSFN time slot; then, the RNC (Radio Resource Controller) configures the MBSFN time slot and the MBMS related channel through broadcast messages or higher layer signaling. The parameter is sent to the cell, so that the UE (user equipment) in the cell can receive the configuration information of the UTRAN. In order to enable the transmission power of the MBMS to cover the entire cell, the control channel for the MBMS and the bearer method of the traffic channel can also be used. Similar to the bearer method of the BCH, all the power of all carriers on the time slot carrying the MBMS channel is concentrated on one carrier for transmission.

 Finally, UEs interested in mobile TV or other MBMS services can receive MBMS services (including mobile TV services) on these MBSFN time slots and Non-MBSFN time slots.

 Specific embodiments will be described below with reference to FIG. 3.

 FIG. 3 is a schematic diagram of implementing an enhanced MBMS technology by using time division multiplexing in an N-frequency cell. First, in an N-frequency cell, the downlink time slot carrying the MBMS service channel is further divided into an MBSFN time slot and a Non-MBSFN time slot; then, in the Node B of the UTRAN, the MBSFN time slot and the Non-MBSFN time slot are configured. And configure the control channel, indicator channel and traffic channel of the MBMS.

 Generally, a multi-frequency cell has multiple frequency points, one primary frequency point and multiple secondary frequency points. Assume that the number of multi-frequency points N-3 includes one primary carrier and two secondary carriers. The broadcast channel (BCH) of the cell is carried on TS0 of the primary carrier.

Only one MCCH (MBMS Control Channel) and one MICH (Indicator Channel of MBMS) are configured in each N-frequency cell, and are all configured on the Non-MBSFN time slot. One or more MTCHs (MBMS traffic channels) may be configured in each N-frequency cell, and some MTCHs are configured on the Non-MBSFN time slots, and some MTCHs are configured on the MBSFN time slots.

 1) MCCH> MICH and part of MTCH (special MBMS services of this part of MTCH bearer cell, such as hotels, restaurants, shopping centers related to this cell) are configured on one or more Non-MBSFN time slots and must be configured to this or On the primary carrier of these time slots, the transmission power of all carriers of the time slot or times is concentrated on the primary carrier, and there is no transmission power on all the secondary carriers.

 The content of the MCCH and the MICH of each cell are different, so it can only be configured on the Non-MBSFN time slot. A part of the MTCH of a cell carries the MBMS service specific to the cell. These MTCHs can only be configured in the Non-MBSFN time slot. on.

 The MBMS channel configured to the Non-MBSFN slot must be configured on the primary carrier of these slots, because in the N-frequency cell of the TD-SCDMA system, before the UE is selected, the UE first selects the dedicated channel. Residing on the primary carrier, the UE can listen to the system broadcast cell on the primary carrier, respond to the paging, initiate a random access procedure, etc., and the MBMS channel configured in the Non-MBSFN time slot does not need to perform macro diversity with the neighboring cell. The same frequency point as the MBMS channel of the neighboring cell is not required.

 The power of all carriers of the Non-MBSFN time slot is concentrated on the primary carrier for transmission, in order to ensure that the signal power of the MCCH and the MICH and the MTCH can cover the entire multi-frequency point cell, and the configuration methods of these logical channels are also adopted and broadcasted. A channel-like configuration method, that is, all the power of the time slot transmitted on the primary carrier, and no transmission power on the secondary carrier.

 The Non-MBSFN time slot in which the MCCH, MICH, or MTCH is configured may also be a TS0 time slot. At this time, on the primary carrier of TS0, MBMS information and broadcast messages are respectively transmitted at different time intervals (TS0 time slots of different radio frames).

2) Part of the MTCH (the part of the MTCH carrying the same MBMS service of each cell) is configured on one or more MBSFN time slots, and can be configured on the primary carrier or a certain secondary carrier of the time slot or the time slots, and the time period is The transmit power of all carriers of the slot is concentrated on this carrier, and there is no transmit power on all other carriers (if transmitting on a certain secondary carrier of MBSFN, the secondary carrier concentrates the total power of all carriers in the slot) , and other carriers, including the main Carrier, no transmit power in this time slot).

 The MBMS channel configured to the MBSFN slot should be at the same frequency as other cells.

 The MBMS service of the cell is the same as the MBMS service of the neighboring cell, that is to say, these MBMS services are the same in multiple cells, such as mobile TV channels. These same MBMS services are configured on the MBSFN time slot, as shown in FIG. 4, which is a method for configuring a mobile TV channel in multiple cells and improving the receiving gain of the UE through enhanced MBMS technology, such as: Cell (cell A, cell B, cell C, cell A has carrier frequency fl, f2, β; cell has carrier frequency Ω, f3, f4; cell C has carrier frequency β, f4, f5, where the first frequency The point is the primary frequency point, and the other is the secondary frequency point; the MBSFN time slot of cell A is TS3, TS4, the MBSFN time slot of cell B is TS4, and the MBSFN time slot of cell C is TS4, TS5), all have the same For a mobile TV channel, the mobile TV channel is configured on the time slot 4 of the carrier frequency β of the cell A (β, TS4), and is arranged on the time slot 4 of the carrier frequency β of the cell (β, TS4), It is also arranged on the time slot 4 of the carrier frequency β of the cell C (β, TS4 ). In this way, the UEs that are interested in the TV channel residing in the cell Α, or ^ or C can obtain the MBMS signals of the three cells, like the three multipaths of one radio signal, and obtain the gain through macro diversity. Get better quality of mobile TV reception.

 When an MBMS channel (including MICH or MCCH or MTCH) is carried on a carrier on one or some downlink time slots, power is generally not allocated on other carriers of the downlink time slot or the like, thereby causing the downlink or the downlink The power of all carriers of the time slot is concentrated to transmit on this carrier to improve the coverage of the MBMS channel. This method is the same as the transmission method of the broadcast channel in the current multi-carrier. Step 2: Send configuration information to the UE in the multi-carrier cell. In a multi-frequency cell configured with an MBSFN slot, the RNC of the UTRAN sends configuration information such as configured MBSFN time slot, Non-MBSFN time slot, and MBMS channel information through system broadcast messages or other high layer signaling. To the entire multi-frequency point cell:

 The specific implementation method of sending configuration information through system broadcast messages:

1) In a system broadcast message, such as: System Broadcast Message 3 (abbreviated as SIB3), a new information element is configured to notify the UE that the cell supports the MBSFN mode, that is, one or more of the downlink time slots of the cell are configured. MBSFN time slot. 2) When the cell is configured with an MBSFN time slot, in a system broadcast message, such as: System broadcast message 5, a new information element is configured to notify the UE which time slots of the cell are MBSFN time slots, and each MBSFN time slot. Related information, including: a slot number, that is, indicating which downlink slot is the MBSFN; frequency point information, that is, on which carrier the MBMS service is carried; and a cell parameter identifier (a cell parameter identifier corresponding to a cell parameter identifier) (middle) code, four scrambling codes). Specific implementation method for sending configuration information through other high layer signaling

 The RNC (Radio Network Controller) of the UTRAN may also notify the UE by using high layer signaling, such as RRC (Radio Resource Control) message, or control information carried on the MCCH, whether the cell is configured with MBSFN time slots, and these MBSFNs. The information related to the time slot, that is, the time slot number described above.

 When the RNC of the UTRAN configures the relevant channels of the MBMS, it needs to indicate which time slot or channels in which these channels are configured, and does not need to indicate at which frequency point (carrier) these channels are configured, because when these channels are configured in the Non-MBSFN time slot When the frequency is inevitably the primary frequency point, when these channels are configured in the MBSFN time slot, the frequency point is determined by the MBSFN time slot configured in the front.

 In the third step, UEs interested in mobile TV or other MBMS services in the cell may receive MBMS services (including mobile TV services) on the MBSFN time slots and Non-MBSFN time slots configured in the configuration information.

 1) The UE can know the configuration information of the MCCH and/or the MICH by receiving a system broadcast message or other RRC message;

 2) Then, on the main carrier of the Non-MBSFN time slot, the MCCH and/or MICH channel can be received;

3) The UE also determines where to receive the MBMS service of interest through the MTCH information configured on the MCCH; if the UE is interested in a certain/some MBMS service (eg, mobile TV), and this/these services are carried in the MBSFN On the time slot, the UE reads the MTCH information according to the known cell parameter ID and the frequency point (which may be the primary carrier or a certain secondary carrier), and can improve the receiving gain through multipath combining; / These services are carried on the Non-MBSFN time slot, then the UE will receive the MTCH information on the primary carrier. Of course, the invention may be embodied in various other forms without departing from the spirit and scope of the invention. Industrial applicability

 The method for realizing enhanced multimedia broadcast and multicast service, ie MBMS, in a multi-frequency point cell is applicable to the field of wireless communication, in particular to time division synchronous code division multiple access

In the TD-SCDMA system, the MBMS services are classified according to the service characteristics, and the common services of the cells are carried on the single-frequency time slots, and the personalized services of the other cells are carried on the non-single-frequency time slots. The multipath combining can be used to enhance the service gain on the single frequency time slot, and the normal service reception of the multi-carrier cell can be considered. The technical solution of the present invention expands the implementation manner of the MBMS service, especially the enhanced MBMS service in the multi-carrier cell, which will greatly improve the application capability of the MBMS service.

Claims

Claim A method for implementing an enhanced MBMS service in a multi-carrier cell, comprising: a. dividing a downlink time slot into an MBSFN time slot and a Non-MBSFN time slot in a multi-carrier cell; Part of the MBMS service is configured on the MBSFN time slot; and the part of the MBMS service unique to each cell is configured on the Non-MBSFN time slot;  b. Send the configuration information to the user terminal in the entire multi-carrier cell;  c. The user terminal receives the MBMS service according to the configuration information. 2. The method according to claim 1, wherein in the step a: configuring an MBMS control channel, an MBMS indicator channel, and a cell-specific part of the MBMS service channel to one or more Non-MBSFN slots The same part of the MBMS traffic channel of each cell is configured to one or more MBSFN slots. The method according to claim 2, wherein in the step a, only one MBMS control channel and one MBMS indication channel are configured in each multi-carrier cell, and one or more MBMS service channels are configured. The method according to claim 1, 2 or 3, wherein in the step a: configuring the MBMS control channel, the MBMS indicator channel and the cell-specific MBMS traffic channel to one or more Non- On the primary carrier of the MBSFN slot;  The same part of the MBMS traffic channel of each cell is configured to one or more MBSFN time slots of the primary carrier or a certain secondary carrier; the same MBMS traffic channel allocated by each cell to the MBSFN time slot should be the same carrier as other cells. The method according to claim 4, wherein in the step a: the transmission power of all carriers of the one or more Non-MBSFN slots is concentrated to be transmitted on the primary carrier; The transmit power of all carriers of the one or more MBSFN slots is concentrated on one carrier for transmission. The method according to claim 1, wherein in the step b, the radio network controller sends the configured MBSFN time slot, the Non-MBSFN time slot, and the MBMS channel information to the system broadcast message to User terminals in the entire multi-carrier cell. The method according to claim 6, wherein in the step b, the radio network controller configures a new information unit in the system broadcast message to notify the user terminal that one of the downlink time slots of the cell is configured or Multiple MBSFN time slots; and inform the user terminal which downlink time slot the MBSFN time slot is, on which carrier the MBMS service is carried, and the current cell parameter identifier. The method according to claim 1, wherein in the step b, the radio network controller sends the configured MBSFN time slot, the Non-MBSFN time slot, and the MBMS channel information to the entire User terminal in a multi-carrier cell. The method according to claim 8, wherein in the step b, the radio network controller notifies the user terminal whether the MBSFN is configured in the local cell by using the radio resource control message or the control information carried on the MBMS control channel. The slot, and which downlink time slot these MBSFN slots are, on which carrier the MBMS service and the local cell parameter identifier are carried. The method according to claim 1, wherein the step c is specifically: the user terminal receives the MBMS control on the primary carrier of the Non-MBSFN time slot according to the configuration information of the MBMS control channel and/or the MBMS indication channel. a channel and/or an MBMS indicator channel; when the user terminal is to receive the MBMS service carried on the MBSFN time slot, the information of the MBMS service channel is read according to the configuration information, and the reception gain is improved by multipath combining; when the user terminal receives the bearer When the MBMS service is on the Non-MBSFN time slot, the information of the MBMS service channel is received on the primary carrier.