WO2009121300A1

WO2009121300A1 - A method and apparatus for transmitting multimedia broadcast and multicast service control data

Info

Publication number: WO2009121300A1
Application number: PCT/CN2009/071128
Authority: WO
Inventors: 杨晓东; 丁昱
Original assignee: 大唐移动通信设备有限公司
Priority date: 2008-04-01
Filing date: 2009-04-01
Publication date: 2009-10-08
Also published as: KR20110008071A; KR101162190B1; CN101552950A; CN101552950B

Abstract

The present invention provides a method and apparatus for transmitting multimedia broadcast and multicast service (MBMS) control data. When transmitting MBMS control data, the method and the apparatus transmit all the sub-frames which are used for bearing the physical broadcast channel and the synchronization channel with a single cell in order that the UE receives one physical broadcast channel only. By therefore ensuring a lower degree of transmission complexity, the problem of UEs which are in cells in the overlapping area of two multimedia broadcast single frequency networks (MBSFNs) being unable to determine how to configure the physical broadcast channel is avoided. Furthermore, by also transmitting the P-MCCH with the sub-frame, the problem of UEs which are in the non-overlapping area of an area with overlapping MBSFN being unable to receive the solid MBMS service data after receiving a P-MCCH or S-MCCH is also avoided.

Description

Multimedia broadcast service control data transmission method

The present invention relates to the field of communications technologies, and in particular, to a multimedia broadcast service control data transmission method and apparatus. Background of the invention

The Multimedia Broadcast and Multicast Service (MBMS) technology broadcasts or multicasts multimedia data to a mobile terminal UE by sharing a transmission link. The purpose of the MBMS service is to provide multi-user downlink data that can be unidirectional from one point to many points in a very efficient, economical, and shared manner. The MBMS system can use a dedicated carrier (E-MBMS) or a carrier shared with a unicast system.

According to the transmission mode of the MBMS service, it can be divided into two modes: multi-cell transmission and single-cell transmission. Multi-cell transmission, the core of which is based on single-frequency network (SFN) downlink macro-diversity soft combining, which transmits service data in units of MBSFN areas in which multiple cells are combined, and requires multiple cells to synchronize. Also known as MBSFN transmission. The MBMS service transmitted by using a single cell transmits MBMS service data by using a cell.

Generally, the MBMS service data of the MBMS system transmits broadcast information of the MBMS service to the user terminal (UE) through a fixed-position subframe in the radio frame, including a physical broadcast channel (P-BCH) and a synchronization channel, where the synchronization channel includes the main channel. Synchronization channel (P-SCH), secondary synchronization signal (S-SCH). The UE accesses the MBMS system by receiving the P-BCH, P-SCH, and S-SCH in the subframe, and then receives an MBMS primary control channel (P-MCCH) indicating the MBMS secondary control channel that the UE should receive (S- The specific location of the MCCH), after receiving the S-MCCH, the UE knows at what time slot and frequency to receive the specific MBMS service data through the MBMS Time Channel (MTCH). The above P-BCH, P-SCH, S-SCH, The P-MCCH, the S-MCCH, and the like are used to implement control functions such as access, selection, and indication before transmitting specific MBMS service data, and can be broadly referred to as MBMS control data.

At present, for the enhanced multimedia broadcast service (E-MBMS) system of the proprietary carrier in LTE, three methods for transmitting MBMS control data are proposed, and FIG. 1 is a subframe structure of the first MBMS control data transmission method. Schematic diagram, as shown in FIG. 1, in a subframe, each rectangular area represents an Orthogonal Frequency Division Multiplexing (OFDM) symbol, using an extended cyclic prefix (ECP), and the subcarrier spacing is 15 kHz. A sub-frame has a total of 12 OFDM symbols. The portion of the OFDM symbols that is not covered by the slanting line indicates that the part of the data is sent to the UE in a single cell manner, and the portion with the slanted line indicates that the OFDM symbol is transmitted to the UE by using the MBSFN mode. It is used to carry specific channel data, also known as OFDM resources. As shown in Figure 1, the P-SCH, S-SCH, and primary P-BCH of the multi-cell MBMS service are transmitted in a single cell, and other parts of the subframe are transmitted using MBSFN.

2 is a schematic diagram of a subframe structure of a second method for transmitting a second MBMS service. As shown in FIG. 2, a P-SCH and an S-SCH of an MBMS service are transmitted by a single cell, and a P-BCH and other parts of the subframe are transmitted. Sent by MBSFN.

FIG. 3 is a schematic diagram of a subframe structure of a third MBMS service transmission method. As shown in FIG. 3, the P-SCH, the S-SCH, the P-BCH of the MBMS service, and other parts of the subframe are all sent by the MBSFN.

In the three MBMS control data transmission methods described above, the control channels P-MCCH and S-MCCH of the MBMS are both transmitted by the MBSFN, but specifically whether they are transmitted in the subframe carrying the physical broadcast channel and the synchronization channel, and There is no specific solution for the specific transmission location in the subframe, and currently there are some problems with these three methods.

In the first method, since the broadcast channel and the synchronization channel data of the MBMS service occupy a part of the reference signal of the MBSFN transmission frame, that is, the pilot, the data estimation of the MBSFN transmission part in the subframe is affected, so that the decoding of the subframe data is performed. Reduced fault tolerance, the same The time broadcast channel also needs to redesign the reference symbols to increase the complexity of the MBMS system to send MBMS services.

In the second method, since the P-BCH is transmitted by the MBSFN, there is a problem that the MBSFN reference signal has to be blindly detected in order to decode the P-BCH, and like the first method, the method also has a problem of complicated transmission.

The third method is the most simple method of sending, and the system has the lowest transmission complexity. Therefore, in LTE, the third method is preferred.

However, in the third method, since the MBSFN coverage areas may overlap, if the UE is in the MBSFN coverage overlap area, some problems may occur. Figure 4 shows a typical MBSFN coverage overlap scenario. As shown in Figure 4, the coverage of MBSFN area 1 and MBSFN area 2 partially overlap. To ensure MBSFN transmission, two MBSFN areas must send another MBSFN. The broadcast information of the area, that is, the above-mentioned subframe for carrying the broadcast information, is transmitted, so as to ensure that the UEs covering the overlapping part can normally access the two MBSFN areas. However, this also causes problems because it has been determined in LTE that the system bandwidth information and the number of system side antennas in the cell are transmitted in the P-BCH. For example, the system bandwidth of MBSFN area 1 is 10M, the number of antennas on the system side is set to 1, and the system bandwidth of MBSFN area 2 is 20M, the number of antennas on the system side is 2, and the system information indicated by P-BCH of two MBSFN areas is different. Thus, the UEs in the cells of the two MBSFN overlapping areas cannot determine which MBSFN area should be accessed, and how to configure the physical broadcast channel.

Also in the second method, since the broadcast channel is also transmitted using MBSFN, the above problem also exists. Although the first method does not cause the above problem because the P-BCH uses single cell transmission, it is not an ideal solution due to the complexity of transmission.

In addition, in the existing method for transmitting multi-cell MBMS control data, both the P-MCCH and the S-MCCH are transmitted in the MBSFN manner, so when the UE is in an overlay, there is overlap. The non-overlapping part of the MBSFN area, since the UE in the non-overlapping part can also receive the P-MCCH and the S-MCCH of another MBSFN area, but the MBSFN service data of another area is not transmitted in one MBSFN area, therefore The UE in the non-overlapping area does not receive the MBMS service data of another MBSF area. The user of the UE does not know whether the received P-MCCH and S-MCCH are the P-MCCH and S-MCCH of the MBSFN area in which the UE is located, so the user of the UE is likely to receive the P-MCCH and the S-MCCH. However, the specific MBMS service data cannot be received, so that the user experience of the MBMS service is adversely affected. Summary of the invention

The embodiment of the present invention provides a multimedia broadcast service control data transmission method, which can prevent a UE in a cell of two MBSFN overlapping areas from determining how to configure a physical broadcast channel under the premise of ensuring low complexity of MBMS service transmission. problem.

An embodiment of the present invention provides a multimedia broadcast service control data transmission apparatus, which can prevent a UE in a cell of two MBSFN overlapping areas from determining how to configure a physical broadcast channel under the premise of ensuring low complexity of MBMS service transmission. problem.

The technical solution of the embodiment of the present invention is implemented as follows:

A multimedia broadcast service control data transmission method, an enhanced multimedia broadcast service E-MBMS system for a proprietary carrier, the method comprising:

The subframes for carrying the physical broadcast channel P-BCH and the synchronization channel are all transmitted to the mobile terminal UE in a single cell mode.

A multimedia broadcast service control data transmission apparatus, an enhanced multimedia broadcast service E-MBMS system for a proprietary carrier, the apparatus comprising:

a subframe generating module, configured to generate a subframe that carries a physical broadcast channel P-BCH and a synchronization channel; The control data sending module is configured to send all the subframes generated by the subframe generating module to the UE in a single cell manner.

It can be seen from the above technical solution that the MBMS control data transmission method and apparatus of the present invention transmit all the subframes for carrying the physical broadcast channel and the synchronization channel by using a single cell when transmitting the MBMS control data, and can ensure that the transmission is performed. On the premise of low complexity, the UE is guaranteed to receive only one physical broadcast channel, which avoids the problem that the UE in the cells of the two MBSFN overlapping areas cannot determine how to configure the physical broadcast channel. By further transmitting the P-MCCH using the subframe, it is further avoided that a UE that covers a non-overlapping portion of the overlapped MBSFN area cannot receive a specific MBMS service after receiving the P-MCCH and the S-MCCH. The problem with the data. By further transmitting the MBMS paging channel in this subframe, it is avoided that different MBSFN areas are covered by the same cell, and multiple MBMS paging channels are configured for the MBSFN area in different MBSFN subframes, so that the UE only needs to Monitor an MBMS paging channel for easy monitoring and save power. By transmitting the single cell MBMS service data also using the remaining resources in the above subframe, the system resources can be further utilized to increase the transmission efficiency of the MBMS system. BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic diagram of a subframe structure of a first MBMS control data transmission method; FIG. 2 is a schematic diagram of a subframe structure of a second MBMS control data transmission method; FIG. 3 is a third MBMS control data transmission. Schematic diagram of the subframe structure of the method; FIG. 4 is a schematic diagram of a typical MBSFN coverage with overlapping scenarios;

FIG. 5 is a schematic diagram of a subframe structure of an MBMS control data transmission method according to Embodiment 1 of the present invention; FIG.

6 is a schematic structural diagram of a subframe of an MBMS control data transmission method according to Embodiment 2 of the present invention; FIG. 7 is a schematic structural diagram of a subframe of an MBMS control data transmission method according to Embodiment 3 of the present invention; FIG.

FIG. 8 is a schematic structural diagram of an MBMS control data transmission apparatus according to an embodiment of the present invention. Mode for carrying out the invention

The present invention will be further described in detail below with reference to the accompanying drawings.

The embodiment of the present invention mainly uses the single cell to transmit the subframes for carrying the MBMS broadcast channel and the synchronization channel when transmitting the MBMS control data, so that the UE only receives one under the premise of ensuring low transmission complexity. P-BCH, avoids the problem that the UEs in the cells of the two MBSFN overlapping areas cannot determine how to configure the physical broadcast channel.

5 is a schematic structural diagram of a subframe of an MBMS control data transmission method according to Embodiment 1 of the present invention. As shown in FIG. 5, subframes for carrying an MBMS physical broadcast channel P-BCH and a synchronization channel are all transmitted by using a single cell; The P-BCH of the OFDM resource in which the existing occupied pilot is located is removed, and only the P-BCH existing in the OFDM resource other than the OFDM resource in which the pilot is located in the subframe is reserved. The purpose of removing the P-BCH of the OFDM symbol in which the existing occupied pilot is located is to further reduce the transmission complexity, and of course it is also possible to remove it.

The P-BCH is transmitted in a single cell, and the UE can be guaranteed to receive only one P-BCH, thereby avoiding the problem that the UE in the cell of the two MBSFN overlapping areas cannot determine how to configure the physical broadcast channel.

FIG. 6 is a schematic structural diagram of a subframe of an MBMS control data transmission method according to Embodiment 2 of the present invention. As shown in FIG. 6 , on the basis of Embodiment 1, the P-MCCH is further carried in the subframe to the UE. The S-MCCH can be sent to the P-MCCH and sent in the subframe sent by the MBSFN. The specific resource location carried by the P-MCCH in the subframe can be determined as needed. Preferably, it is carried in the subframe without other channels occupying The vacant OFDM resources may be carried, for example, in any OFDM resource locations other than the P-BCH, the P-SCH, the S-SCH, and the pilot.

The P-MCCH is also transmitted in a single cell, so that the UE can only receive the P-BCH of one MBSFN area, so that the UE that is in a non-overlapping part covering the overlapping MBSFN area receives the P-MCCH and the S- The problem of subsequent MBMS service data cannot be received after MCCH.

Compared with the first embodiment, the MBMS paging channel is further carried by the subframe. Since the MBMS paging channel is transmitted in a single cell manner, only the same cell covered by different MBSFN areas may be received. To an MBMS paging channel, the UE only needs to listen to the one paging channel, thereby avoiding the multiple MBMS paging channels configured in the subframes that are sent by the UE in different MBSFN manners in different MBSFN areas. The situation of monitoring makes the UE monitor more convenient and saves power. Similarly, the MBMS paging channel is arbitrarily carried in a specific bearer position in the subframe, and is preferably carried in the OFDM resource in the subframe without other channels, for example, can be carried in P-BCH, P-SCH, S- Any idle OFDM resource location other than SCH, P-MCCH and pilot. Of course, it is not necessary to use the MBMS paging channel for carrying the subframe, which is only a preferred method.

In addition, in the above subframe, if there is still OFDM resources, the OFDM resources can be used to carry the single-cell MBMS service data (the part marked with MBMS in the figure), and the system resources can be fully utilized. The specific bearer location is arbitrary, and is preferably carried in the OFDM resource in the subframe without other channels, for example, may be carried in P-BCH, P-SCH, S-SCH, P-MCCH, MBMS paging channel and guide. Any idle OFDM resource location other than the frequency.

In fact, the above P-BCH, P-SCH, S-SCH, P-MCCH, MBMS paging channel, single cell MBMS service data, and specific OFDM resource bits carried by the pilot in the subframe The settings can be arbitrary, and they do not overlap each other. In addition, the subframes carrying the MBMS broadcast channel and the synchronization channel are all transmitted by using a single cell, and may also be combined with the specific bearer used for the P-BCH, the P-MCCH, the MBMS paging channel, or the single-cell MBMS service data. In this way, various embodiments can be combined, and will not be mentioned here.

The above embodiment is an embodiment in the case where the subframe uses a subcarrier spacing of 15 KHz. Generally, the MBMS system adopts the subframe structure, but the inventive idea of the embodiment of the present invention is adopted regardless of the subframe structure. Suitable, for example, a sub-frame structure employing a 7.5 KHz subcarrier spacing. There are only 6 OFDM symbols in the subframes with 7.5 KHz subcarrier spacing. In this case, the specific OFDM resources in the subframe can be allocated as shown in Figure 7.

FIG. 7 is a schematic structural diagram of a subframe of an MBMS control data transmission method according to Embodiment 3 of the present invention. As shown in FIG. 7, since OFDM resources are small, in order to ensure sufficient channel resources, S-SCH and part of P-BCH may need to occupy part. The OFDM resources in which the pilots are located, the other parts are similar to the 15 KHz subcarrier spacing, and are not mentioned here.

FIG. 8 is a schematic structural diagram of an MBMS control data transmission apparatus according to an embodiment of the present invention. As shown in FIG. 8, the apparatus includes:

a subframe generating module 801, configured to generate a subframe that carries an MBMS broadcast channel and a synchronization channel;

The subframe sending module 802 is configured to send all the subframes generated by the subframe generating module 801 to the UE in a single cell manner.

The subframe generation module 801 may further include a broadcast channel bearer unit 803, configured to carry the physical broadcast channel in the spare OFDM resources other than the OFDM resources occupied by the pilots in the subframe, and further reduce the complexity.

In addition, the subframe generation module 801 may further include a primary control channel bearer unit 804, configured to carry the P-MCCH in the subframe, preferably in a spare OFDM resource that is not occupied by other channels, thereby avoiding coverage in one coverage. Non-overlapping portions of overlapping MBSFN regions The UE that fails to receive the specific MBMS service data after receiving the P-MCCH and the S-MCCH, and further reduces the complexity of transmitting the MBMS control data by the system under different MBSFN area coverage.

At the same time, the subframe generating module 801 may further include a paging channel bearer unit 805, configured to carry the MBMS paging channel in the subframe, preferably in the spare OFDM resource occupied by other channels, thereby avoiding different MBSFNs. When the area is covered by the same cell, multiple MBMS paging channels are configured for the MBSFN area in the subframe where the MBSFN is located, so that the UE can conveniently monitor and save power.

Preferably, the subframe generating module 801 may further include a single cell service bearer unit 806, configured to carry the single cell MBMS service data in the subframe, preferably in the spare OFDM resource occupied by other channels, and fully utilize system resource.

The subframe generated by the subframe generation module 801 may be a subframe of 15 KHz subcarrier spacing, or may be a subframe of 7.5 KHz subcarrier spacing. The device can be set in a device such as a base station.

For specific operations performed by the modules and units in the foregoing apparatus embodiments, reference may be made to the specific description in the foregoing method embodiments, and details are not described herein again. All of the above embodiments are based on the proprietary carrier-based enhanced multimedia broadcast service E-MBMS system, and are also applicable to other MBMS systems.

It can be seen from the above embodiments that the MBMS control data transmitting method and apparatus of the present invention transmit all the subframes for carrying the MBMS broadcast channel and the synchronization channel in a single cell when transmitting the MBMS control data, and ensure transmission complexity. On the lower premise, the problem that the UE in the cells of the two MBSFN overlapping areas cannot determine how to configure the physical broadcast channel is avoided. By further transmitting the P-MCCH using the subframe, it is further avoided that a UE that covers a non-overlapping portion of the overlapped MBSFN area cannot receive a specific MBMS service after receiving the P-MCCH and the S-MCCH. Data problem, lower The complexity of transmitting MBMS control data by the system under different MBSFN area coverage. By further transmitting the MBMS paging channel in this subframe, it is avoided that multiple MBMS paging channels are configured for different MBSFN areas in the MBSFN area, so that the UE can be easily monitored. , save power. By transmitting the single cell MBMS service data by using the remaining resources in the above subframe, the system resources can be further utilized to increase the transmission efficiency of the MBMS system.

It is to be understood that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention, any modifications, equivalents, Improvements and the like should be included in the scope of the present invention.

Claims

Claim

A multimedia broadcast service control data transmission method, characterized in that the method comprises:

The method for transmitting data of a multimedia broadcast service control according to claim 1, wherein the physical broadcast channel P-BCH is carried by an orthogonal frequency division multiplexing OFDM resource occupied by pilots in the subframe. Outside of the vacant OFDM resources.

The method for transmitting data of a multimedia broadcast service control according to claim 1 or 2, wherein the method further comprises:

The MBMS primary control channel P-MCCH is carried in the subframe to be transmitted to the UE.

The method for transmitting data of a multimedia broadcast service control according to claim 3, wherein the method further comprises:

The P-MCCH is carried in a spare OFDM resource in the subframe that is not occupied by other channels.

The MBMS paging channel is carried in the subframe to be transmitted to the UE.

The method for transmitting data of a multimedia broadcast service control according to claim 5, wherein the method further comprises:

The MBMS paging channel is carried in a spare OFDM resource in the subframe that is not occupied by other channels.

The method for transmitting data of a multimedia broadcast service control according to claim 1 or 2, wherein the method further comprises: The single cell MBMS service data is carried in the subframe and sent to the UE.

The method of claim 7, wherein the method further comprises:

The single cell MBMS service data is carried in the spare OFDM resources in the subframe that are not occupied by other channels.

The multimedia broadcast service control data transmission method according to claim 1 or 2, wherein the subframe uses a subcarrier spacing of 15 kHz or a subcarrier spacing of 7.5 kHz.

10. A multimedia broadcast service control data transmission apparatus, the apparatus comprising:

a subframe generating module, configured to generate a subframe that carries a physical broadcast channel P-BCH and a synchronization channel;

And a control data sending module, configured to send all the subframes generated by the subframe generating module to the UE in a single cell manner.

The multimedia broadcast service control data transmission apparatus according to claim 10, wherein the subframe generation module comprises:

And a broadcast channel bearer unit, configured to carry the physical broadcast channel P-BCH in the spare OFDM resource except the OFDM resource occupied by the pilot in the subframe.

The multimedia broadcast service control data transmission apparatus according to claim 7 or 8, wherein the subframe generation module further comprises:

And a primary control channel bearer unit, configured to carry the P-MCCH in the subframe.

The multimedia broadcast service control data transmission apparatus according to claim 12, wherein the primary control channel bearer unit is specifically configured to carry the P-MCCH in the subframe without spare OFDM occupied by other channels. In the resource.

The multimedia broadcast service control data transmission apparatus according to claim 7 or 8, wherein the subframe generation module further comprises: The paging channel bearer unit is configured to carry the MBMS paging channel in the spare OFDM resources in the subframe that are not occupied by other channels.

The multimedia broadcast service control data transmission apparatus according to claim 14, wherein the paging channel bearer unit is specifically configured to carry the MBMS paging channel in the subframe without spare space occupied by other channels. In OFDM resources.

The single cell service bearer unit is configured to carry the single cell MBMS service data in the spare OFDM resources in the subframe without other channels.

The multimedia broadcast service control data transmission apparatus according to claim 16, wherein the single cell service bearer unit is specifically configured to carry the single cell MBMS service data in the subframe without any other channel occupation. In vacant OFDM resources.

The multimedia broadcast service control data transmission apparatus according to claim 7 or 8, wherein the subframe generated by the subframe generation module uses a 15 kHz subcarrier spacing or a 7.5 kHz subcarrier spacing.