Wireless communication system for minimizing redundant enhanced uplink allocation requests and fault-isolating enhanced uplink transmission failures

A wireless communication system that minimizes redundant enhanced uplink configuration requests and error isolation enhanced uplink transmission failure

This creation is about a wireless communication system, which includes a wireless transmission/reception unit (hereinafter referred to as WTRU), at least one Node B, and a radio network controller (hereinafter referred to as RNC). The present invention is especially a wireless communication system, which is used to minimize the redundant enhanced uplink (hereinafter referred to as EU) configuration request and the error isolation EU transmission failure.

Methods to improve the coverage, production capacity and transmission delay time of the uplink (hereinafter referred to as UL) have been studied in the third generation partnership project (3GPP) version 6 (R6). In order to successfully implement these methods, the scheduling and allocation of UL radio resources will be moved from a radio network controller (RNC) to a Node B, so that Node B will determine and manage UL radio resources on a short-range basis more than RNC. Efficiency, even if the RNC maintains overall control higher than that of the Node B.

In order to enable the WTRU to transmit on an enhanced dedicated channel (hereinafter referred to as E-DCH), the WTRU must identify the need for E-DCH transmission by transmitting an E-DCH channel configuration request to the Node B. Next, the Node B provides the configuration of E-DCH physical resources to the WTRU that has requested the E-DCH channel.

When the UL resources are insufficient for the E-DCH channel configuration request, the Node B cannot immediately configure the resources for E-DCH transmission to all WTRUs that have requested the E-DCH. If the WTRU fails to receive a channel within a preset period of time E-DCH configuration, the WTRU may resend the request until the WTRU receives E-DCH channel configuration information.

Because the transmission of the E-DCH channel configuration request will interfere with other WTRUs, when each WTRU transmits and retransmits the same channel configuration request multiple times, the UL EU channel will increase the UL interference, and the overall efficiency of the system will be therefore reduce.

Therefore, when maintaining proper EU scheduling operation, it is necessary to minimize the utilization of the UL transmission signal channel. In addition, steps to isolate EU transmission failures by mistake are also required.

This creation is about a wireless communication device, which is used to minimize redundant EU configuration requests and error isolation EU transmission failures that occur between a WTRU and a Node B. When the WTRU is scheduled to transmit E-DCH data, the WTRU transmits an enhanced dedicated channel (E-DCH) configuration request to the Node B through a UL EU channel.

In an embodiment according to the present creation, the Node B receives the channel configuration request, and determines whether the channel configuration can be provided to the WTRU within a preset channel request response period. If the WTRU channel configuration can be provided within a preset channel request response period, the Node B will send scheduling information (ie E-DCH channel configuration information) to the WTRU, otherwise the Node B will only send an acknowledgement A message is sent to the WTRU to indicate that the channel configuration request has been received, but a channel configuration has not been sent. In response to the confirmation message, the WTRU refrains from transmitting the same channel configuration request within a preset maximum time for the configuration period, and places the request in the Node B's queue. If the maximum time for the configuration period is exceeded without receiving a channel configuration, the WTRU retransmits the channel configuration request.

In another embodiment according to the present creation, appropriate measures are taken to correct EU transmission failures by determining whether an E-DCH configuration request has not been successfully delivered via the UL EU channel, or whether channel configuration information has not been successfully delivered. Successfully delivered via the DL EU sending signal channel.

Through the description of a preferred embodiment, the examples given below, and the corresponding drawings, this creation can be understood in more detail.

Hereafter, the term "WTRU" includes but is not limited to a user equipment (UE), a mobile station, a fixed or mobile subscriber unit, a pager, or any type of device that can operate in a wireless environment. When this article refers to the dedicated term "Node B" hereinafter, it includes but is not limited to a base station, a site controller, an access point, or any interface device that is known in a wireless environment.

The features of this creation can be integrated into an integrated circuit (IC) or configured on a circuit containing many interconnected components.

Fig. 1 is a block diagram of a wireless communication system 100 according to the present invention. The system 100 includes a WTRU 102, one or more Node Bs 104, and an RNC 106. The RNC 106 configures EU parameters to the Node B 104 and the WTRU 102 to control the overall EU operation, such as the maximum allowable EU transmission power of each Node B or the effective channel resources. The WTRU 102 sends a channel configuration request to the Node B 104 through a UL EU channel 110, and the Node B 104 sends channel configuration information through one or more downlink (DL) EU signal channels 112. After the EU radio resources are allocated to the WTRU 102, the WTRU 102 transmits data through the UL EU channel 110. The Node B includes a request priority queue 114 for arranging E-DCH configuration requests in the queue, and a timer 116 for configuring the maximum time to establish an E-DCH configuration request response time period . The WTRU includes a channel configuration response timer 118 for generating periodic channel configuration requests when a channel configuration is not received by the Node B 104.

FIG. 2 is a flowchart of a procedure 200 for reducing congestion in the UL EU channel 110 according to an embodiment of the present invention. When the WTRU 102 has the E-DCH data to be transmitted, the WTRU 102 sends an E-DCH configuration request to the Node B 104 through the UL EU channel 110 (step 202), and the sending signal of the E-DCH configuration request can be Send signals for the physical layer or the media access control (MAC) layer.

According to the E-DCH configuration request received by the WTRU 102, the Node B will determine whether there are free E-DCH resources that can be allocated to the WTRU within a preset channel request response time period (step 204). The channel request response time period is the maximum time period during which the Node B 104 should respond to a channel configuration request. When the E-DCH configuration request is received by the Node B 104, it is used by the Node B 104 to configure the maximum time period. The timer 116 starts the channel request response time period established. The channel request response time period can be a fixed value in the system, or the RNC 106 can be used for each EU radio access bearer (RAB) Configure and send a signal to the Node B 104 and the WTRU 102.

If there are free E-DCH resources, the Node B 104 will send an acknowledgment message to the WTRU 102 to indicate that the E-DCH configuration request has been received (step 206), and will also send a signal channel through the DL EU Send scheduling information (ie, E-DCH configuration information), which is within the channel request response time period (step 207), and the WTRU 102 then transmits data through the UL EU channel 110 according to the scheduling information (step 208).

If the E-DCH resource cannot be configured before the channel request response time period expires, the Node B 104 will send an acknowledgement message to the WTRU 102 to indicate that the E-DCH configuration request has been received, but not Before the channel request response time period expires, the scheduling information is sent to the WTRU 102 (step 210). The confirmation message does not contain the scheduling information, but only confirms that the Node B 104 has received the channel configuration request, and when The request will be processed when resources are available.

According to another embodiment of the present creation, the E-DCH configuration request indicates its priority. After sending the confirmation message to the WTRU 102 to confirm receipt of the E-DCH configuration request, the E-DCH configuration request is stored in a request priority queue 114 of the Node B 104, which is based on the The priority order indicated by the request (step 212). When the request is placed in the priority queue 114 of the request, the timer 116 for configuring the maximum time is started, and the E-DCH configuration request is received at the same time The time will be recorded. The maximum time used to configure is a maximum time period. In this period, the E-DCH configuration request should be received and delivered before the E-DCH configuration request is finally determined to be invalid, and each transmission is mapped to a specific data In terms of stream or data priority level, the maximum time for configuration can be unique.

Requests within the request priority queue 114 of the Node B 104 can be delivered according to the first-in-first-out (FIFO) rule. If there are not enough resources, the configuration will be further delayed until resources are available. If If there are free resources, the Node B 104 will serve at least one request in the priority queue 114 of the request.

According to the confirmation message received by the Node B 104, in response to the received E-DCH configuration request, the WTRU 102 checks whether the scheduling information is also received, or checks whether only the channel configuration request is confirmed. If the scheduling information is received, the WTRU 102 will transmit data through the UL EU channel 110 according to the scheduling information specified by the Node B 104 (step 208). If it is confirmed that only the E-DCH configuration request is received, The WTRU 102 will know that the Node B 104 has received the E-DCH configuration request, and will refrain from retransmitting the same request (step 214).

After the channel configuration request is received and no scheduling information is confirmed, the Node B 104 may later provide the EU channel configuration to the WTRU 102, and the request has been queued to the request priority queue 114 of the Node B 104 middle. Periodically, at each transmission time interval (TTI) in step 216, the Node B 104 determines whether there are resources available for allocation to the request in the request priority queue 114 (step 218), if there are resources , The program 200 will execute steps 207 and 208.

If there are no resources, the Node B 104 will determine whether the timer 116 for configuring the maximum time expires (step 220).

If the timer 116 used to configure the maximum time has not expired, as the decision made in step 220, the program 200 will wait for the next TTI in step 216, and the Node B 104 can configure the maximum time to arrive soon Priority allocation of the period.

After the timer 116 used to configure the maximum time expires, that is, after a predetermined period of time has passed after the recording request reception time, the WTRU 102 relies on its channel configuration response timer 118, which is used to track every The maximum configuration time period of an E-DCH configuration request. Each time the WTRU 102 sends an E-DCH configuration request to the Node B 104, the WTRU 102 will set the channel configuration response timer 118 and follow the channel configuration Respond to the expiration of the timer 118 to identify that the configuration is invalid. Otherwise, if the WTRU 10-2 does not maintain its own channel configuration response timer 118, the Node B 104 will notify the WTRU 102 that the configuration is invalid. If the WTRU 102 maintains its own channel configuration response timer 118 , Then the Node B 104 does not need to notify the WTRU 102 of the failure.

When the E-DCH configuration failure occurs, the WTRU 102 has several options. The WTRU 102 can retransmit the E-DCH configuration request or an update request to the Node B 104 (step 224), each time the channel is configured When the response timer 118 expires, step 224 can be executed periodically. Otherwise, if the WTRU 102 has more E-DCH data to transmit, the WTRU 102 may discard the information, which requests a configuration and sends an update E-DCH configuration request (step 226).

FIG. 3 is a flowchart of a procedure 300 for determining the invalidation of the signal channel during configuration according to another embodiment of the present creation. When the WTRU 102 has EU data to be transmitted, the WTRU 102 sends an E-DCH configuration request to the Node B 104 and starts the channel configuration response timer 118 (step 302). After sending the E-DCH configuration request, the WTRU 102 waits for the Node B 104 to receive scheduling information (ie, E-DCH configuration information) until the channel configuration response timer 118 expires. If the WTRU 102 cannot receive the scheduling information from the Node B 104 before the channel configuration response timer 118 expires (step 304), the WTRU 102 will retransmit the same E-DCH configuration request, accompanied by a retransmission. Request indicator or an update E-DCH configuration request (step 306).

In this case, the WTRU 102 does not know whether the UL EU sends a signal (that is, the E-DCH configuration request), or the DL EU sends a signal (that is, the channel configuration) is lost, if the Node B 102 receives a new signal Transmit the E-DCH configuration request (step 308), the Node B 104 will determine where the failure occurs (that is, the E-DCH configuration request on the UL EI channel 110, or the signal channel 112 through the DL EU If the Node B 104 receives a retransmission of an E-DCH configuration request that has not yet been delivered, the Node B 104 will determine that the E-DCH configuration request was not successfully transmitted on the UL EU channel 110 (step 314 ), no matter whether step 312 or 314 is performed, the Node B 104 will then take appropriate corrective actions based on the identified failure. The Node B 104 will then process the received request (step 316).

This creation ensures that when the E-DCH channel configuration is not immediately provided by the Node B 104, the E-DCH configuration request will be received by the Node B 104, and the EU UL signal load will be minimized. Use this creation This method will make UL physical resources more effective.

Although the features and elements of this creation are all described in the embodiments in a specific combination, each feature or element in the embodiment can be used alone, without being combined with other features or elements, and can also be combined with/without this creation. Other features and components are combined in different ways.

Although this creation has been described through the preferred embodiments, other variations that do not depart from the scope of the patent application of this creation are obvious to those who are familiar with this technique.

<p>100Wireless communication system</p><p>102Wireless transmission/receiving unit</p><p>104Node B</p><p>106Wireless Network Controller</p><p>110UL EU channel</p><p>112DL EU transmit signal channel</p><p>114Request priority queue</p><p>116Configure the timer with the maximum time</p><p>118Channel configuration response timer</p>

Fig. 1 is a block diagram of a wireless communication system according to the present invention; Fig. 2 is a flowchart for reducing congestion in the UL EU channel established in the system of Fig. 1 according to an embodiment of the present invention; and 3 is a flow chart of another embodiment according to the present creation for determining the channel to send signals and performing corrective actions during the channel configuration period.