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HK1169261A - A wireless transmit/receive unit and a method for minimizing e-dch allocation requests - Google Patents

A wireless transmit/receive unit and a method for minimizing e-dch allocation requests Download PDF

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Publication number
HK1169261A
HK1169261A HK12109937.3A HK12109937A HK1169261A HK 1169261 A HK1169261 A HK 1169261A HK 12109937 A HK12109937 A HK 12109937A HK 1169261 A HK1169261 A HK 1169261A
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HK
Hong Kong
Prior art keywords
allocation
dch
request
dch allocation
time period
Prior art date
Application number
HK12109937.3A
Other languages
Chinese (zh)
Inventor
张国栋
史蒂芬.G.迪克
史蒂芬.E.泰利
Original Assignee
美商内数位科技公司
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Application filed by 美商内数位科技公司 filed Critical 美商内数位科技公司
Publication of HK1169261A publication Critical patent/HK1169261A/en

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Abstract

The present invention provides a method for minimizing enhanced dedicated channel (E-DCH) allocation requests by a wireless transmit/receive unit (WTRU) and a wireless transmit/receive unit (WTRU), the method comprising: requesting an E-DCH allocation, wherein the E-DCH allocation is requested including E-DCH transmission data, and on a condition that E-DCH allocation information is not received within a predetermined channel request response period, re-requesting the E-DCH allocation or requesting an updated E-DCH allocation and refraining from further requesting the E-DCH allocation for a second predetermined channel request response period.

Description

Wireless transmitting/receiving unit and method for minimizing E-DCH allocation request thereof
The present application is a divisional application of the chinese patent application entitled "method and apparatus for minimizing redundant enhanced uplink configuration request and error isolation enhanced uplink transmission failure" filed as 26/4/2005 and application No. 200580011128.7.
Technical Field
The present invention relates to wireless communication systems including a wireless transmit/receive unit (WTRU), at least one node-B, and a Radio Network Controller (RNC). In particular, the present invention is a method and apparatus for minimizing redundancy Enhanced Uplink (EU) allocation request and error isolation EU transmission failures.
Background
Nowadays, research is being conducted on methods for improving Uplink (UL) coverage, throughput, and transmission delay time in the third generation partnership project (3GPP) release 6 (R6). To successfully perform these methods, scheduling and allocation of UL radio resources has been handed over from a Radio Network Controller (RNC) to a node B so that the node B can make decisions and manage UL radio resources on a short-range basis more efficiently than the RNC, even though the RNC still maintains overall control of the node B.
In order for a WTRU to transmit on an enhanced dedicated channel (E-DCH), the WTRU must indicate that an E-DCH transmission is required by transmitting an E-DCH channel allocation request to a node B. The node B then provides the allocation of E-DCH physical resources to the WTRU that has requested the E-DCH channel.
When the UL resources are not sufficient for the E-DCH channel allocation request, the node B cannot immediately allocate resources for the E-DCH transmission to all WTRUs that have requested the E-DCH. If the WTRU fails to receive the E-DCH allocation within the predetermined time period, the WTRU may resend the request until the WTRU receives the E-DCH channel allocation information.
Since the transmission of an E-DCH channel allocation request may interfere with other WTRUs, the UL EU channel will increase UL interference when each WTRU transmits and retransmits the same channel allocation request multiple times. The overall efficiency of the system will therefore be reduced.
Therefore, there is a need to be able to minimize the use of UL signaling channels while maintaining proper EU scheduling operation. In addition, a process for error isolating EU transmission failures is required.
Disclosure of Invention
The invention provides a method for minimizing an E-DCH allocation request by a WTRU, which comprises the following steps: requesting an E-DCH allocation, wherein the E-DCH allocation is requested to comprise E-DCH transmission data; and re-requesting the E-DCH allocation or requesting an updated E-DCH allocation in case the E-DCH allocation information is not received within a predetermined channel request response time period, and not requesting the E-DCH allocation anymore during a second predetermined channel request response time period.
The invention also provides a method for minimizing the E-DCH allocation request by the WTRU, which comprises the following steps: requesting E-DCH allocation; determining whether a response message to the allocation request is received; and in case no reply message to the allocation request is received, re-requesting the E-DCH allocation or requesting an updated E-DCH allocation and no longer requesting the E-DCH allocation during a second predetermined channel request response time period.
The present invention also provides a WTRU comprising: a transmitter configured to transmit an E-DCH allocation request, wherein the request for the E-DCH allocation includes E-DCH transmission data; a channel allocation response timer configured to time a predetermined channel request response time period; and wherein the transmitter is further configured to retransmit the E-DCH allocation request if the E-DCH allocation cannot be received in response to the E-DCH allocation request within the predetermined channel request response time period, and to no longer request the E-DCH retransmitted allocation during a second predetermined channel request response time period.
The present invention also provides a WTRU comprising: a transmitter configured to transmit an E-DCH allocation request; a channel allocation response timer configured to time a predetermined channel request response time period; circuitry configured to discard data for which the E-DCH allocation has been requested if the E-DCH allocation cannot be received in response to the E-DCH allocation request within the predetermined channel request response time period; and wherein the transmitter is further configured to transmit an updated E-DCH allocation request if the E-DCH allocation cannot be received in response to the E-DCH allocation request within the predetermined channel request response time period, and to not re-request the updated E-DCH allocation during a second predetermined channel request response time period.
Drawings
The invention will be understood in more detail from the following description of preferred embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a block diagram of a wireless communication system according to the present invention;
fig. 2 is a flow diagram of a process for reducing congestion within an UL EU channel established in the system of fig. 1, according to one embodiment of the present invention; and
fig. 3 is a flow diagram of a process for determining signaling channel failure and performing corrective action during channel allocation according to another embodiment of the present invention.
Detailed Description
Hereinafter, the dedicated 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 other type of device that may operate in a wireless environment. When referred to hereafter, the terminology "node B" includes but is not limited to a base station, a site controller, an access point, or any other type of interfacing device in a wireless environment.
The features of the present invention may be integrated within an Integrated Circuit (IC) or may be configured on a circuit comprising a multitude of interconnecting components.
Fig. 1 is a block diagram of a wireless communication system 100 in accordance with the present invention. The system 100 includes a WTRU102, one or more node bs 104, and an RNC 106. RNC 106 controls the overall EU operation by configuring EU parameters, such as maximum allowed EU transmit power or available channel resources per node-B, for node-B104 and WTRU 102. The WTRU102 sends a channel allocation request to the node-B104 over the UL EU channel 110, and the node-B104 sends channel allocation information over one or more Downlink (DL) EU signaling channels 112. After allocating EU radio resources to the WTRU102, the WTRU102 transmits data over the UL EU channel 110. The node B includes a request priority queue 114 for queuing E-DCH allocation requests and a maximum allocation time timer 116 for establishing an E-DCH allocation request response time period 116. The WTRU includes a channel allocation response timer 118 for generating a periodic channel allocation request when no channel allocation is received from the node-B104.
Fig. 2 is a flow diagram of a process 200 for reducing congestion in UL EU channel 110 according to one embodiment of the present invention. When the WTRU102 has E-DCH data to transmit, the WTRU102 sends an E-DCH allocation request to the node-B104 over the UL EU channel 110 (step 202). The signaling of the E-DCH allocation request may be physical layer signaling or Medium Access Control (MAC) layer signaling.
Upon receiving the E-DCH allocation request from the WTRU102, the node-B104 determines whether there are resources available for allocating an E-DCH to the WTRU within a predetermined channel request response time period (step 204). The channel request response time period is the maximum time period that the node B104 should respond to a channel allocation request. When the node B104 receives the E-DCH allocation request, the channel request response time period established by the maximum allocation time timer 116 of the node B104 is activated. The channel request response time period may be a fixed value in the system or may be configured by RNC 106 for each EU Radio Access Bearer (RAB) and signaled to node-B104 and WTRU 102.
If the E-DCH resources are available, the node-B104 sends an acknowledgement message to the WTRU102 indicating that the E-DCH allocation request has been received (step 206), and the node-B104 also sends scheduling information (i.e., E-DCH allocation information) over the DL EU signaling channel 112 within the channel request response time period (step 207). The WTRU102 then transmits data over the UL EU channel 110 according to the scheduling information (step 208).
If the E-DCH resources cannot be allocated before the channel request response time period expires, the node-B104 also sends an acknowledgement message to the WTRU102 indicating that the E-DCH allocation request has been received, but the node-B104 does not send scheduling information to the WTRU102 before the channel request response time period expires (step 210). The reply message does not include scheduling information, but merely confirms that node B104 has received the channel allocation request and will process the request when resources are available.
According to one embodiment of the invention, the E-DCH allocation request indicates a priority. After sending an acknowledgement message to the WTRU102 confirming receipt of the E-DCH allocation request, the E-DCH allocation request is stored in the request priority queue 114 of the node-B104 based on the priority indicated by the request (step 212). The maximum time allocation timer 116 is activated when the request is placed in the request priority queue 114 and the time of receipt of the E-DCH allocation request is recorded. The maximum allocation time is the maximum period of time that an E-DCH allocation request should be serviced before it is eventually determined to fail. The maximum allocation time may be unique for each transmission mapped to a particular data stream or data priority class.
Requests within the request priority queue 114 of the node B104 may be serviced (service) according to a first-in-first-out (FIFO) rule. If there are not enough resources, the allocation is further delayed until there are available resources. If there are resources available, the node B104 will service at least one request in the request priority queue 114.
Upon receiving an acknowledgement message from the node-B104 in response to receiving the E-DCH allocation request, the WTRU102 checks whether scheduling information is also received or whether only a channel allocation request is acknowledged. If scheduling information is received, the WTRU102 transmits data over the UL EU channel 110 according to the scheduling information indicated by the node-B104 (step 208). If only a reply to the receipt of the E-DCH allocation request is received, WTRU102 knows that node-B104 has received the E-DCH allocation request and does not retransmit the same request (step 214).
Upon receiving the channel allocation request and having no scheduling information upon acknowledgement, the node-B104 may then provide EU channel allocations to the WTRUs 102 for those WTRUs 102 whose requests have been queued in the node-B104 request priority queue 114. The node B104 periodically, possibly every Transmission Time Interval (TTI) in step 216, determines whether there are available resources to allocate to the requests in the request priority queue 114 (step 218). If there are resources available, the process 200 proceeds to steps 207 and 208.
If there are no resources available, the node B104 determines whether the maximum allocation time timer 116 has expired (step 220).
If the maximum allocation time timer 116 has not expired, the process 200 waits for the next TTI at step 216, as determined at step 220. The node B104 may prioritize allocation of allocation requests for which the maximum allocation time, i.e., will expire.
After the maximum allocation time timer 116 expires or a predetermined period of time elapses after the recorded request reception time, the WTRU102 relies on its channel allocation response timer 118 to track the maximum allocation time period for each E-DCH allocation request. The WTRU102 sets the channel allocation response timer 118 each time an E-DCH allocation request is sent to the node-B104 and upon expiration of the channel allocation response timer 118, the WTRU102 recognizes the allocation failure. Alternatively, if the WTRU102 does not maintain its own equivalent channel allocation response timer 118, the node-B104 may notify the WTRU102 of the allocation failure. If the WTRU102 maintains its own channel allocation response timer 118, the node-B104 does not need to notify the WTRU102 of the failure.
When the E-DCH allocation failure occurs, the WTRU102 has several options. The WTRU102 may retransmit the E-DCH allocation request or updated request to the node-B104 (step 224). Step 224 may be performed periodically each time the channel allocation response timer 118 expires. Alternatively, if the WTRU102 has more E-DCH data to transmit, the WTRU102 may discard the data it has requested an allocation and send an updated E-DCH allocation request (step 226).
Fig. 3 is a flow diagram of a process 300 for determining signaling channel failure during channel allocation in accordance with another embodiment of the present invention. When the WTRU102 has EU data to transmit, the WTRU102 sends an E-DCH allocation request to the node-B104 and activates the channel allocation response timer 118 (step 302). After sending the E-DCH allocation request, the WTRU102 waits to receive scheduling information (i.e., E-DCH allocation information) from the node-B104 until the channel allocation response timer 118 expires. If the WTRU102 fails to receive scheduling information from the node-B104 before the channel allocation response timer 118 expires (step 304), the WTRU102 retransmits the same E-DCH allocation request with a retransmission indicator or an updated E-DCH allocation request (step 306).
In this embodiment, the WTRU102 is not aware of whether UL EU signaling (i.e., E-DCH allocation request) or DL EU signaling (i.e., channel allocation) is missing. If node B104 receives a retransmission E-DCH allocation request (step 308), node B104 determines where the failure occurred (i.e., either an E-DCH allocation request in UL EU channel 110 or a channel allocation over DL EU signaling channel 112). If node B104 receives a retransmitted E-DCH allocation request that has not yet been serviced, node B104 determines that the E-DCH allocation request was not successfully transmitted on the UL EU channel 110 (step 312). If node B104 receives a retransmitted E-DCH allocation request that has already been serviced, node B104 determines that the E-DCH allocation information was not successfully transmitted on the DL EU channel 112 (step 314). Whether performed in steps 312 or 314, the node B104 may take appropriate corrective action based on the determined failure. The node B104 then processes the received request (step 316).
The present invention ensures that when node B104 does not immediately provide an E-DCH channel allocation, the E-DCH allocation request will be received by node B104 and the EU UL signaling load will be minimized. The use of the method of the present invention allows more efficient use of UL physical resources.
Although the features and elements of the present invention are described in the preferred embodiments in particular combinations, each feature or element can be used alone without the other features and elements, and indeed, can be combined in various combinations with/without other features and elements of the present invention.
While the invention has been described in terms of preferred embodiments, other variations which do not depart from the scope of the invention should be apparent to those skilled in the art.

Claims (9)

1. A method of minimizing an enhanced dedicated channel (E-DCH) allocation request by a wireless transmit/receive unit (WTRU), the method comprising:
requesting an E-DCH allocation, wherein the E-DCH allocation is requested to comprise E-DCH transmission data; and
in case the E-DCH allocation information is not received within a predetermined channel request response time period, the E-DCH allocation is re-requested or an updated E-DCH allocation is requested and no more E-DCH allocation is requested during a second predetermined channel request response time period.
2. The method of claim 1, wherein requesting the E-DCH allocation does not include transmitting data.
3. A method of minimizing an enhanced dedicated channel (E-DCH) allocation request by a wireless transmit/receive unit (WTRU), the method comprising:
requesting E-DCH allocation;
determining whether a response message to the allocation request is received; and
in case no reply message to the allocation request is received, re-requesting the E-DCH allocation or requesting an updated E-DCH allocation and no longer requesting the E-DCH allocation during a second predetermined channel request response time period.
4. The method according to claim 3, wherein the E-DCH allocation or an updated E-DCH allocation is re-requested after expiration of a predetermined channel request response time period.
5. The method according to claim 4, wherein re-requesting the E-DCH allocation or requesting an updated E-DCH allocation comprises a retransmission indicator.
6. The method according to claim 3, wherein the E-DCH allocation or an updated E-DCH allocation is re-requested before a predetermined channel request response time period expires.
7. The method according to claim 6, wherein re-requesting the E-DCH allocation or requesting an updated E-DCH allocation comprises a retransmission indicator.
8. A wireless transmit/receive unit (WTRU), comprising:
a transmitter configured to transmit an enhanced dedicated channel (E-DCH) allocation request, wherein the E-DCH allocation is requested to include E-DCH transmission data;
a channel allocation response timer configured to time a predetermined channel request response time period; and
wherein the transmitter is further configured to retransmit the E-DCH allocation request if the E-DCH allocation is not received in response to the E-DCH allocation request within the predetermined channel request response time period, and to not request the E-DCH retransmitted allocation during a second predetermined channel request response time period.
9. A wireless transmit/receive unit (WTRU), comprising:
a transmitter configured to transmit an enhanced dedicated channel (E-DCH) allocation request;
a channel allocation response timer configured to time a predetermined channel request response time period;
circuitry configured to discard data for which the E-DCH allocation is requested if the E-DCH allocation is not received in response to the E-DCH allocation request within the predetermined channel request response time period; and
wherein the transmitter is further configured to transmit an updated E-DCH allocation request in the event that the E-DCH allocation is not received in response to the E-DCH allocation request within the predetermined channel request response time period, and not to re-request the updated E-DCH allocation during a second predetermined channel request response time period.
HK12109937.3A 2004-04-30 2008-08-13 A wireless transmit/receive unit and a method for minimizing e-dch allocation requests HK1169261A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US60/567,144 2004-04-30

Related Parent Applications (1)

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HK08108993.2A Addition HK1118163A (en) 2004-04-30 2005-04-26 Method and apparatus for minimizing redundant enhanced uplink allocation requests and fault-isolating enhanced uplink transmission failures

Related Child Applications (1)

Application Number Title Priority Date Filing Date
HK08108993.2A Division HK1118163A (en) 2004-04-30 2005-04-26 Method and apparatus for minimizing redundant enhanced uplink allocation requests and fault-isolating enhanced uplink transmission failures

Publications (1)

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HK1169261A true HK1169261A (en) 2013-01-18

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