Method and device for transmitting multimedia broadcast multicast service control data

Abstract

The invention discloses a method and a device for transmitting multimedia broadcast and multicast service (MBMS) control data. When the MBMS control data is sent, subframes for carrying MSBM broadcast channels and synchronizing channels all adopt a method and a device for sending with a single cell, thereby avoiding the problem that UE in a cell of two multicast broadcast single frequency network (MBSFN) overlapped areas cannot determine how to deploy physical broadcast channels on the premise of guaranteeing lower sending complexity. Furthermore, physical multicast control channel (P-MCCH) is also transmitted by the subframes, thus the problem that the UE of a non-overlapped part of an area covered with overlapped MBSFN cannot receive specific MBMS data after receiving P-MCCH and secondary multicast control channel (S-MCCH) is further solved so as to reduce the complexity for sending the MBMS control data of a system under the condition of covering different MBSFN areas.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular, to a method and device for transmitting multimedia broadcast service control data. Background technique [0002] The Multimedia Broadcast and Multicast Service (MBMS, Multimedia Broadcast and Multicast Service) technology broadcasts or multicasts multimedia data to the mobile terminal UE by sharing a transmission link. The purpose of the MBMS service is to provide multiple users with unidirectional downlink multimedia data from one point to multiple points in a very efficient, economical and shared manner. The MBMS system can use a dedicated carrier (E-MBMS), or can share the carrier with the unicast system. [0003] 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 downlink macro-diversity soft combining based on single ...

AI Technical Summary

Problems solved by technology

[0009] In the first method, because the broadcast channel and synchronization channel data of the MBMS service need to delete a part of the reference signal (ie pilot) of the MBSFN transmission frame, there will be some problems in the data estimation of the MBSFN transmission part, and at the same time, the broadcast channel needs to be redesigned. symbol, which will cause the complexity of the MBMS system for sending MBMS services

[0010] In the second method, since P-BCH is sent by MBSFN, it will encounter the problem of blind detection of MBSFN reference signaling in order to decode P-BCH, and like the first method, this method also has the problem of complex transmission

Although the first method does not cause the above problems because the P-BCH is transmitted by a single cell, it is not ideal due to the complexity of the transmission.

[0014] In addition, in the existing method for sending multi-cell MBMS control data, both P-MCCH and S-MCCH are transmitted by MBSFN, so when the UE is in a non-overlapping part of an overlapping MBSFN area, since the UE in the non-overlapping part The P-MCCH and S-MCCH of another MBSFN area can also be received, but the MBSFN service data of another area will not be sent in one MBSFN area, so UEs in non-overlapping areas cannot receive another MBSFN area of MBMS business data

The UE user does not know whether the received P-MCCH and S-MCCH are the P-MCCH and S-MCCH of the MBSFN area where it is located, so the UE user is likely to receive the P-MCCH and S-MCCH After that, the specific MBMS service data cannot be received, which makes the user's experience of using the MBMS service badly affected.

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