Evolved-multimedia Broadcast Multicast Service Packet Transmission Method, Gateway And Base Station
A technology for multimedia broadcast and multicast services, which is applied to gateways and base stations that implement the packet transmission method, evolves the field of packet transmission of multimedia broadcast and multicast services, and can solve problems such as synchronization damage, different data, and inability to resynchronize, and achieve overhead. Small, small modification effects
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Embodiment 1
[0083] Although the base station 202 ( Figure 1C ) does not know the exact multiplexing scheme, but the number of multiplexed services is known. The scheduling period proposed by the present invention is as follows image 3 shown. Packets belonging to the same service are grouped together; different services are transmitted one by one in a predetermined transmission order; and padding data is added only after the last service. Therefore, the logical channel changes only when a traffic switch occurs within a transport block (TB). Therefore, a feasible MAC solution lies in:
[0084] ●In each scheduling cycle, the last MAC packet data unit (PDU) carrying a specific service contains a MAC subheader, and the number of MAC subheaders is equal to the number of services in the last position in the MAC PDU; the MAC The format of the subheader is the same as Figure 2B Same, used to indicate the length of the corresponding MAC service data unit (SDU) in the MAC PDU;
[0085] ● Fo...
Embodiment 2
[0097] If the scheduling information is not received correctly, the UE will try to start reception from the first subframe until all interested subframes are received. However, in case the UE wants to receive the second service but fails to decode the first MAC PDU (containing the MAC subheader), the UE has no way of knowing from which MAC PDU the service of interest starts. Therefore, additional information is required. Considering the above problems, the following improvement scheme is proposed, and the specific illustrations can be referred to Figure 5 :
[0098] ● For each MAC PDU, use the R / R / E / LCID header as the first header;
[0099] ■LCID (Logical Channel Identification) indicates the last logical channel in the MAC PDU;
[0100] ■ In the case of service switching, two MAC headers can be added for the last service in the MAC PDU, one of which is the above R / R / E / LCID header, and the other is the normal R / R / E / LCID / F / L header (in this specification, it will be refer...
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