KR200390102Y1 - Wireless communication system for configuring cells with enhanced uplink services - Google Patents

Abstract

A system for configuring cells for a wireless multicell communication system and enhanced uplink (EU) services. The wireless communication system includes at least one wireless transmit / receive unit (WTRU), at least one Node-B and a radio network controller (RNC). The RNC configures EU services for WTRUs and Node-Bs in at least one cell of the system. At least one of the WTRU and Node-B reports EU traffic statistics and EU performance statistics to the RNC. The RNC adjusts the configuration of EU services for WTRU and Node-B in the at least one cell according to the received EU traffic statistics and EU performance statistics.

Description

WIRELESS COMMUNICATION SYSTEM FOR CONFIGURING CELLS WITH ENHANCED UPLINK SERVICES

The present invention relates to a wireless multicell communication system including at least one wireless transmit / receive unit (WTRU), at least one node-B, and a radio network controller (RNC). . More specifically, the present invention is a system for configuring and operating a specific system cell with enhanced uplink (EU) services.

Methods for improving uplink (UL) coverage, throughput, and transmission delays are currently being investigated in the 3rd generation partnership project (3GPP). To achieve this goal, control (ie scheduling and allocation) of UL resources (ie, physical channels) will be moved from the RNC to Node-B.

Node-B can make decisions more efficiently than RNC and manage UL radio resources on a shorter basis. However, the RNC must maintain coarse overall control of the cell with EU services to perform functions such as call admission control and congestion control.

The present invention is a system for configuring EU services in a wireless multicell communication system. The wireless communication system includes at least one WTRU, and at least one Node-B, and an RNC. The RNC configures EU services for Node-B and WTRUs in at least one cell of the system. At least one of the WTRU and Node-B reports EU traffic statistics and EU performance statistics to the RNC. The RNC adjusts the configuration of EU services for the WTRU and Node-B in at least one cell according to the received EU traffic statistics and EU performance statistics.

The term "WTRU" includes, but is not limited to, user equipment (UE), mobile station, fixed or mobile subscriber unit, pager, or any other type of device capable of operating in a wireless environment. As mentioned below, the term "node-B" includes, but is not limited to, a base station, a site controller, an access point, or any other type of interfacing device capable of operating in a wireless environment.

Features of the present invention may be integrated into an integrated circuit (IC) or may consist of a circuit comprising a plurality of interconnect components.

1 is a block diagram of a wireless multicell communication system 100 in accordance with the present invention. System 100 includes at least one WTRU 102, at least one Node-B, and an RNC 106. Enhanced dedicated channel (with associated signaling channels) for EU transmissions between WTRU 102 and Node-B 104 in addition to Dedicated channel (DCH) 110 channel 108 is established. Of course, those of ordinary skill in the art will appreciate, as with any downlink (DL) channels, between WTRU 102 and Node-B 104 that FIG. 1 is not specifically related to the present invention. It will be understood that not all of the signaling is represented.

The RNC 106 controls the overall EU operation via the Iub / Iur interface 112 by configuring parameters for EU transmissions for the Node-B 104 and the WTRU 102, described in detail below. Since the RNC 106 schedules EU transmissions on the E-DCH (ie, uplink) on a per TTI basis, cell level or system level such as call admission control and congestion control without closely monitoring Node-B. Run the functions

The present invention provides a solution for the RNC 106 to maintain coarse overall control of a cell with EU services. With proper configuration for EU services, the RNC 106 can maintain overall control of the cells, and cell resources can be efficiently used for both regular DCHs 110 and E-DCHs 108.

The RNC 106 configures initial parameters for EU services when the system is initialized. The configuration for EU services includes the limitation of the interference caused by EU transmissions at any time in each cell and the limitations of physical resources (ie channelization codes) that can be used for EU transmissions.

RNC 106 constitutes channelization codes that can be used for EU transmissions scheduled by Node-B 104. Initially, the number of channelization codes that can be used for EU transmissions is determined taking into account the expected load of regular DCH traffic, the expected load of E-DCH traffic, and the like.

The expected load of regular DCH traffic in the UL is determined by the required energy-to-noise ratio per bit, data rate, and activity factor. The expected load of E-DCH traffic is based on the possible Modulation and Coding Schemes (MCS), the likelihood that each MCS will be applied, the ratio of energy to noise required per bit of each MCS, and possible transport format combinations (TFC: Transport format combination), the possibility that each TFC can be applied, and the activity coefficient.

Once the number of channelization codes that can be used for EU transmissions is determined for each cell, the RNC 106 sets up a portion of the code tree, including the determined number of channelization codes, in the cell for EU services, Send it to at least one Node-B 104. In order to send the assignment from the RNC 106 to the Node-B 104, a new Iub / Iur procedure is executed or an modulation of an existing Iub / Iur procedure is provided between the Node-B 104 and the RNC 106. do.

The interference caused by EU transmission on a per TTI basis is under the control of Node-B 104 rather than the RNC 106, while the interference caused by regular DCH traffic is under the control of the RNC 106. However, it is important to say that the RNC 106 limits the interference of each system cell caused by EU transmissions. Therefore, the RNC 106 must execute cell level or system level functions such as call admission control and congestion control, and node-B 104 when scheduling EU transmissions over the E-DCH 108 on a per TTI basis. Should be suppressed.

Initially, the maximum allowed interference caused by EU transmissions is for the expected load of regular DCH traffic at the UL, the expected load of E-DCH traffic, and all traffic of the UL in that cell and its surrounding cells. The maximum allowable interference is determined in consideration. RNC 106 configures Node-B 104 with the maximum allowed EU interference limit.

Node-B 104 performs scheduling of EU transmissions on a per TTI basis in accordance with the restrictions set by RNC 106. The channelization codes used by any scheduled EU transmissions must belong to the channelization codes assigned by the RNC 106. The transmit power allocated by Node-B 104 scheduling must not exceed the maximum allowed EU interference limit set by the RNC. The RNC 106 sends some configuration / reconfiguration of the EU services in the WTRU 102 to the Node-B 104. The configuration of the WTRU includes a transport format combination set (TFCS) for the E-DCH of the WTRU 102, the MCSs allowed for the E-DCH of the WTRU 102, and the WTRU 102. It may include, but is not limited to, at least one of the maximum allowed WTRU transmit powers.

If TFCs and MCSs are explicitly identified in the schedule sent by Node-B 104, then the allowed TFCs and MCSs must belong to the TFCs and MCSs allowed by RNC 106. Transmission of channel allocation information is by either physical layer or MAC layer signaling. Node-B 104 may schedule EU transmissions for several users at the same time. However, the overall interference caused by EU transmissions in any TTI is required to be within the interference limit for all affected cells, as determined by the RNC 106. Node-B 104 may use explicit or implicit TFCS management to control cell interference.

Once the WTRU 102 begins to operate on the E-DCH 108, EU traffic statistics and EU performance statistics are generated and sent to the RCN 106 by at least one of the WTRU 102 and the Node-B 104. Is reported.

EU traffic statistics may be the amount of EU data transmitted successfully or unsuccessfully or traffic volume measurement (TVM) of EU data. EU performance statistics include resource usage per cell and / or per WTRU, positive / non-acknowledge (ACK / NACK) ratio per cell / resource and / or per WTRU, (or average number of failed transmissions within the MAC layer), Average channel quality indicator (CQI) results (or best or worst CQI results) per cell / resource and / or per WTRU, and the WTRU maximum transmit power is reached or the EU maximum transmit power of the WTRU is reached. It may include, but is not limited to, at least one of the number of cases.

The report may be periodic or threshold based. Periods or thresholds of reporting are set by the RNC 106 and are also design parameters.

EU traffic and performance statistics may be reported to the RNC 106 by the WTRU 102 via radio resource control (RRC) procedures. In this case, RNC 106 collects EU traffic statistics of WTRUs 102 within the same cell to obtain total EU traffic statistics in each cell. The RNC 106 also calculates the average of the reported performance of all WTRUs 102 in the same cell to obtain average performance statistics for the WTRUs 102 in each cell.

Alternatively, EU traffic and performance statistics may be reported by Node-B 104. In this case, EU traffic and performance statistics are generated by the WTRU 102 and reported to Node-B 104 via physical or MAC layer signaling, which may be either new signaling or modulated existing signaling. EU traffic and performance statistics are then sent to the RNC 106 via new or modulated Iub / Iur procedures.

Other measurement data known only to the Node-B 104 may also be sent to the RNC 106 to allow the RNC 106 to control EU resources. This is at least one of the code power received on EU assigned codes reported on the WTRU or cell basis, interferences received based on EU assigned codes, or ACK / NACK ratio recognized by Node-B 104. It can include but is not limited to one.

In addition to the EU traffic and performance statistics and measurement reports sent to the RNC 106, the adjustment of the configuration of EU services also includes the traffic and performance statistics of the regular DCH and several EU performance statistics, itself. You may rely on some of the information collected by.

Upon receiving the reported EU and performance statistics and measurement reports from the WTRU 102 and / or Node-B 104, the RNC 106 coordinates the configuration of EU services at the Node-B 104 and the WTRU 102. do.

2 is a signal diagram of a process 200 executed by a system for signaling between a WTRU 102, a Node-B 104, and an RNC 106 for configuring and reconfiguring cells with EU services according to the present invention. to be. The RNC 106 initiates the initial configuration (such as channelization code, maximum interference, maximum allowed TFCS / MCSs, maximum allowed E-DCH and WTRU power, etc.) through the Iub / Iur 112 interface of the system 100. Transmits to Node-B 104 at step 202. The RNC 106 also sends WTRU configuration information (eg, maximum allowed TFCS / MCSs and maximum allowed E-DCH and WTRU power, etc.) for the EU services to the WTRU 102 via an RRC message (step 204).

EU scheduling is executed by Node-B 104 within the limitations of the configuration set by RNC 106 and sent to WTRU 102 by physical or MAC layer signaling (step 206). The WTRU 102 may report EU traffic and performance statistics (such as TVM, amount of transmitted data, ACK / NACK ratio, CQI, and number of maximum power cases, etc.) to the RNC 106 via an RRC message (step 208). Are reported to Node-B 104 by physical or MAC layer signaling (step 210) and transmitted to RNC 106 by an Iub / Iur procedure (step 212). The RNC 106 reconfigures the cells with EU services according to the reported statistics (step 202).

Although features and elements of the present invention are described in particular combinations in the preferred embodiments, each feature or element may be used alone or have or have other features and elements of the present invention without the other features and elements of the preferred embodiment. May be used in various combinations.

The present invention provides a system for configuring and operating a particular system cell with enhanced uplink services.

A more detailed understanding of the present invention may be made from the preferred embodiments described below, given by way of example and understood in conjunction with the accompanying drawings.

1 is a block diagram of a wireless communication system constructed in accordance with the present invention.

2 is a signal diagram of the processing executed by the system of FIG. 1 to configure EU services.

Claims (17)

A wireless multicell communication system for controlling at least one cell of a system to support enhanced uplink (EU) services: (a) at least one wireless transmit / receive unit (WTRU), configured to transmit EU traffic statistics and EU performance statistics; (b) at least one Node-B configured to communicate with the WTRU and to transmit EU traffic statistics and EU performance statistics; And (c) receive the EU traffic statistics and EU performance statistics from at least one of the WTRU and Node-B and have EU services for the WTRU and Node-B in accordance with the received EU traffic statistics and EU performance statistics. Radio Network Controller (RNC) in communication with the Node-B and WTRU to coordinate the configuration of at least one cell of the system A wireless multicell communication system comprising a. 10. The system of claim 1 wherein the initial configuration for Node-B includes a restriction on channelization codes for EU transmissions. 3. The wireless multicell of claim 2, wherein the limit on channelization codes is determined in consideration of at least one of an expected load of a regular dedicated channel (DCH) in the uplink and an expected load of EU traffic. Communication system. 4. The system of claim 3 wherein the expected load of DCH traffic is determined in consideration of at least one of the required energy-to-noise ratio, bit rate, and activity factor per bit. 4. The expected load of EU traffic according to claim 3 is at least one of possible modulation and coding schemes (MCS), the possibility that each MCS is applied, the required energy-to-noise ratio per bit of each MCS, and the possible transmission. And determined in view of at least one of format combinations (TFCs), the possibility each TFC may be applied, and an activity factor. 10. The system of claim 1 wherein the initial configuration for Node-B includes a restriction on interference caused by EU transmissions. 7. The method of claim 6, wherein the limit on interference caused by EU transmissions is determined taking into account at least one of an expected load of regular dedicated channel (DCH) traffic on the uplink and an expected load of EU traffic. Wireless multicell communication system. 8. The system of claim 7, wherein the expected load of DCH traffic is determined in consideration of at least one of the required energy-to-noise ratio per bit, data rate, and activity factor. 8. The method of claim 7, wherein the expected load of EU traffic includes: possible modulation and coding schemes (MCS), the possibility that each MCS is applied, the required energy to noise ratio per bit of each MCS, possible transport format combinations, And determine at least one of the likelihood that each TFC can be applied, and an activity factor. The wireless multi-cell communication system of claim 1, wherein the maximum allowed interference in the uplink in the cell and neighboring cells is also considered to determine a limit to the interference. 2. The method of claim 1, wherein the configuration of EU services for the WTRU comprises: an allowed transport format combination set (TFCS) for the E-DCH of the WTRU, an allowable MCS for the enhanced dedicated channel (E-DCH) of the WTRU; And at least one of a maximum allowed E-DCH transmit power of the WTRU, and a maximum allowed WTRU transmit power. 12. The system of claim 11 wherein the configuration of the EU services for the WTRU is also sent to the Node-B. 2. The system of claim 1, wherein the EU traffic statistics comprise at least one of a measure of traffic volume of EU data and an amount of EU data transmitted successfully or unsuccessfully. The method of claim 1, wherein the EU performance statistics are failed in the resource usage per cell, resource usage per WTRU, ACK / NACK rate per cell, ACK / NACK per resource, ACK / NACK rate per WTRU, medium access control (MAC) layer. Average number of transmissions, average channel quality indicator (CQI) results per cell, average CQI results per WTRU, best CQI results, worst CQI results, number of cases where the WTRU maximum transmit power is reached, and the EU maximum And at least one of a number of cases where transmit power is reached. 10. The system of claim 1 wherein the transmission of statistics is periodic. 10. The system of claim 1 wherein the transmission of statistics is triggered by a predetermined threshold test. 2. The system of claim 1 wherein the adjustment of the configuration is also dependent on information collected by the RNC, including traffic and performance statistics for normal dedicated channels (DCH) and other EU transmission statistics.