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A packet data multicast communication system, a station, and a method of operating the system

A technology of multicast communication and packet data, which is applied in the field of communication systems and can solve problems such as wasting downlink resources.

Active Publication Date: 2011-05-18
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If only a small fraction of UEs are requesting retransmissions, it may be undesirable to waste a lot of downlink resources retransmitting packets to these UEs

Method used

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  • A packet data multicast communication system, a station, and a method of operating the system
  • A packet data multicast communication system, a station, and a method of operating the system
  • A packet data multicast communication system, a station, and a method of operating the system

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Embodiment Construction

[0018] Referring to Fig. 1, there is shown a radio frequency communication system, such as a UMTS system, comprising a network represented by a base station BS and a plurality of user equipment (UE) or mobile stations MS1, MS2, MS3. A mobile station is able to roam within the radio frequency coverage area of ​​a base station and maintain radio frequency communication through spread spectrum signaling on the downlink from the base station and the uplink from the mobile station. As is usually the case with spread spectrum signaling, several signals may be transmitted simultaneously, each signal having its own signature, or a spreading code selected from a set of signatures. Additionally, power control must be implemented to prevent weaker signals from being swamped by stronger signals. Thus, the base station can specify the maximum power that the mobile station can transmit on the uplink within the scope of the transmission parameters which it freely handles.

[0019] Referring...

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PUM

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Abstract

A method of operating a packet data multicast communication system which comprises a network or NodeB (BS) and a plurality of mobile stations (MS1, MS2, MS3). The network and the mobile stations have transceiving equipment (14, 34) for the transmission of data packets on a downlink between the network and mobile stations, and feedback signalling (ACK / NACK) on an uplink. The mobile stations have means for receiving a data packet transmitted by the first station, means (46) for measuring the quality of reception, means (30, 48) for determining into which one of at least three predetermined quality ranges the measured quality falls. Each of the at least three predetermined quality ranges represents a respective transmitter behaviour of the first station and the transmitter behaviour corresponding to at least two non-contiguous ones of the quality ranges is identical.

Description

technical field [0001] The present invention relates to a packet data multicast communication system, stations used therein and a method of operating the system. More specifically, the present invention relates to communication systems that require an acknowledgment mechanism for feedback signaling in a retransmission scheme. The invention has particular, but not exclusive application to cellular telephone systems such as UMTS (Universal Mobile Telecommunications System). Background technique [0002] A retransmission scheme for reliable data delivery in a multicast structure, ie a point-to-multipoint structure, is required for communication systems such as UMTS (Universal Mobile Telecommunications System). Such schemes usually imply using some form of feedback mechanism between the user equipment (UE) and the network (NodeB), which can lead to a lot of feedback signaling when the number of UEs is large. [0003] The concept and working mode of the downlink retransmission ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/18H04L1/18
Inventor O·J·-M·胡斯M·P·J·贝克T·J·穆尔斯利P·布克内尔
Owner KONINKLIJKE PHILIPS ELECTRONICS NV