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Packet Scheduling and Quality of Service in HSDPA

Separate forward dedicated and shared control channels (17, 18) are provided in a spread-spectrum communication. The forward dedicated control channel (18) is used to communicate persistent control information and point to the shared control channel (17) when further intermittent control information concerning transmission of data to a mobile station (14) needs to be communicated. The use of a dedicated control channel for only necessary persistent control information, while only pointing to a shared control channel when it is needed, affords more efficient utilization of system resources.

Apparatus and method for providing separate forward dedicated and shared control channels in a communications system

A method and wireless communication system for providing channel assignment information used to support an uplink (UL) channel and a downlink (DL) channel. The system includes at least one Node-B and at least one wireless transmit/receive unit (WTRU). The WTRU communicates with the Node-B via a common control channel, the UL channel and the DL channel. The WTRU receives a message from the Node-B via the common control channel. The message includes an indication of whether the message is intended for assigning radio resources to the UL channel or the DL channel. The WTRU determines whether the message is intended for the WTRU and, if so, the WTRU determines whether the message is for assigning radio resources to the UL channel or the DL channel. The WTRU takes an appropriate action based on whether the message is for assigning radio resources to the UL channel or the DL channel.

Method and system for providing channel assignment information used to support uplink and downlink channels

A transmission path estimation circuit (12) in an individual-CH path demodulation part (1A-1L) performs a transmission path estimation from an individual CH, and thereafter a transmission path estimation value correction circuit (22) in a shared-CH path demodulation part (2A-2L) corrects reception power variations due to an upstream transmission power control caused by a timing offset between the individual-CH and the shared-CH. The resultant output from the transmission path estimation value correction circuit (22) is used for a modulation by a shared-CH demodulation circuit (23).

Cdma receiving apparatus and method

The high-speed downlink packet access (HSDPA) is currently an important research topic to enhance the downlink performance of a WCDMA network. It is a set of schemes built on top of the downlink shared channel (DSCH), resulting an extremely high bit rate for a single user in the downlink. When the channel condition is good, a high utilization of the code resource for a single user can be effectively achieved. However, when the channel condition is bad, a fraction of the code resource would be wasted because only a user can use a small fraction of the code resource. Thus, code multiplexing offers a solution to utilize the limited code resource more effectively. In this paper, the effect of code multiplexing on the HSDPA performance is studied in a dynamic simulator platform. It means that the code resource is shared among a few users. Multicode transmission is also considered in the study. Two, semi-static and dynamic code sharing, multiplexing cases are studied. The number, n, of the code multiplexing users is one of the study parameters. The simulation results show that code-multiplexing can increase the throughput in a WCDMA network by improving code utilization while also decreasing the transfer delay between the base station and the terminals.

The effect of code-multiplexing on the high speed downlink packet access (HSDPA) in a WCDMA network

One of the targets for a wideband CDMA (W-CDMA) system is to provide an efficient transfer of low bit rate to very high bit rate packet data services. A shared channel concept has been proposed for both the downlink and uplink channels that is better suited for bursty packet data traffic. The shared channels allows UEs to transmit and receive data bursts at high rates by using short leases on the radio resource thereby lowering the overall delay by taking the greatest advantage of statistical multiplexing. The high rate bursts require the network tightly manage its resources to insure that the appropriate OVSF codes are assigned on the downlink and the aggregate interference does not exceed the noise rise on the uplink. In both cases, the network must convey the new assignments on a frame by frame basis. In this paper, packet data transmission using both downlink shared channel (DSCH) and uplink shared channel (USCH) is discussed for a W-CDMA system.

K. Felix

Papers

Shared channels for packet data transmission in W-CDMA