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Collaborative transmission method for wireless broadcasting multicast service

A technology for broadcast and multicast services and coordinated transmission, which is applied in the field of coordinated transmission of wireless broadcast and multicast services, and can solve the problems of throughput and spectral efficiency limitations, costing large resources, etc., so as to improve spectral efficiency and throughput and save overhead. , the effect of reducing the number of

Inactive Publication Date: 2010-12-15
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the wireless broadcast multicast transmission technology based on network coding can effectively reduce the number of source retransmissions, when the channel condition between the source and the receiver is poor, retransmission still needs to spend a lot of resources, and the system throughput Quantity and spectral efficiency are limited by worst-case channel conditions between source and receiver

Method used

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  • Collaborative transmission method for wireless broadcasting multicast service
  • Collaborative transmission method for wireless broadcasting multicast service
  • Collaborative transmission method for wireless broadcasting multicast service

Examples

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Embodiment 1

[0094] Figure 5 It is a flow chart of Embodiment 1 of the method for coordinated transmission of wireless broadcast multicast services according to the present invention, and this embodiment is based on a cellular wireless communication system. In this embodiment, both the information source and the control node are base stations, and all resource allocation, physical and media access layer (MAC) signaling are all controlled by the base station, and the specific steps are:

[0095] Step 101: the base station judges whether the current time slot is an uplink time slot or a downlink time slot, if it is a downlink time slot, then enter step 102, otherwise, enter step 105;

[0096] Step 102: The base station judges whether all the cluster users in the last downlink time slot feedback are NACK: if yes, the base station retransmits the data packet sent in the last downlink time slot, and enters step 104; otherwise, if there is at least one cluster user If the feedback is ACK, ente...

Embodiment 2

[0108] This embodiment is based on a cellular radio communication system. In this embodiment, the information source is a base station, and the control node is a cluster head. The base station can allocate fixed time-frequency resources to the cluster during the cluster establishment process. The retransmission scheduling in the cluster is controlled by the CH. For the base station, the processing process is similar to that of unicast, and the base station may not know the existence of other members in the cluster. Therefore, the broadcast of the base station and the retransmission in the cluster can be regarded as two processes, and the broadcast of the base station is independent of the retransmission process in the cluster. Figure 7a It is a flow chart of base station broadcasting in the coordinated transmission method for wireless broadcast multicast services described in Embodiment 2 of the present invention. see Figure 7a , the specific steps of the base station bro...

Embodiment 3

[0123] Figure 8 It is a flow chart of the coordinated transmission method of the wireless broadcast multicast service described in Embodiment 3 of the present invention. This embodiment is based on a distributed wireless communication network, such as a wireless ad hoc network. In this embodiment, the information source is the distributed Other nodes outside the cluster in the wireless communication network, such as wireless access points, the control node is the cluster head. Described method specifically comprises:

[0124] Step 301: the source sends a broadcast request to the CH, the CH sends a start (START) signaling to the source, and the source broadcast starts;

[0125] Step 302: the information source judges whether there are new broadcast and multicast service data packets to be sent, if so, the information source broadcasts a new data packet p, and enters step 303; otherwise, the information source broadcasts SBME, and enters step 307;

[0126] Step 303: cluster u...

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Abstract

The invention discloses a collaborative transmission method for a wireless broadcasting multicast service. The method comprises the steps that: A, a control node controls an information resource to transmit a broadcasting multicast service data packet to a cluster user; and B, the control node selects one or more cluster members to retransmit the data packet to the cluster user who does not receive the data packet correctly in a cluster. When the method is used, information source broadcast is only required to ensure that each data packet is at least correctly received by one cluster user in the cluster, the cluster user who correctly receives the data packets in the cluster can retransmit the data packets to the cluster user with a packet error till all the users correctly receive all the data packets. The retransmission of the broadcasting multicast service data packet is mainly carried out among the cluster users, so that the broadcasting multicast information retransmission times of the information source are greatly reduced, and the energy consumption of the information source is reduced; meanwhile, network encoding technology is adopted for the retransmission among the cluster users, so that the cast brought by retransmitting each wrong data packet in the traditional scheme is saved and the frequency spectral efficiency and the throughput of a system are improved.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a coordinated transmission method of wireless broadcast multicast services. Background technique [0002] With the continuous advancement of wireless communication technology, the wide application of wireless communication networks, the rapid improvement of the performance of wireless communication equipment, and the rapid growth of the number of wireless communication users, the realization of broadcast and multicast technology in wireless communication networks has become a hot spot in the development of wireless communication systems. one. The application of wireless broadcast and multicast technology will greatly expand the business scope of wireless communication, such as news broadcast, weather forecast, network interactive games and mobile TV. [0003] Reliable broadcast multicast transmission must ensure that each receiving user can correctly receive all t...

Claims

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Application Information

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IPC IPC(8): H04W4/06H04W28/04H04L1/18
CPCY02B60/50Y02D30/70
Inventor 李立华张平杨桅宋磊
Owner BEIJING UNIV OF POSTS & TELECOMM
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