WO2008022502A1

WO2008022502A1 - Method for timing among channels in the td-cdma system

Info

Publication number: WO2008022502A1
Application number: PCT/CN2006/003775
Authority: WO
Inventors: Hu Liu; Hua Rui; Peng Geng; Hui Chen; Yinchneg Zhang
Original assignee: Zte Corporation
Priority date: 2006-08-18
Filing date: 2006-12-30
Publication date: 2008-02-28
Also published as: CN101128035B; CN101128035A

Abstract

A method for timing among channels in the TD-CDMA system, aiming at the problem that in the existed TD-CDMA timing manner, UE searches the E-AGCH frequently and the power waste of UE is too much, which do not fit for TD-CDMA system. To solve the above problem, the method for timing among channels in TD-CDMA system includes the following steps: (1) the scheduling request initiated by user device to the base station ends; (2) after a first minimum time interval, the down-link E-AGCH channel is established between user device and the base station. This invention solves the timing relation between each of the HSUPA technique channels in TD-CDMA system, and makes them be adapted to the frame structure of TD-CDMA, prevents UE from searching E-AGCH frequently, reduces the power waste of UE, so the resource could be allocated more flexible and be fully utilized.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timing relationship between various channels in a wireless communication system, particularly a time division code division multiple access wireless communication system. BACKGROUND OF THE INVENTION In the third generation mobile communication system, in order to provide higher rate uplink packet services and improve spectrum utilization efficiency, 3GPP (3rd Generation Partnership Project) introduces high speed uplink packet access in specifications of WCDMA and TD-CDMA systems. (HSUPA: High Speed Uplink Packet Access) feature, that is, uplink enhancement. The HSUPA system is also known as the uplink enhancement system, referred to as the E-DCH system. In the TD-CDMA system, the physical layer I of the HSUPA system enters the E-PUCH physical channel for transmitting the CCTrCH of the E-DCH type. The scheduling entity located in the MAC-e of the NodeB is responsible for the allocation of physical resources of the E-PUCH (Enhanced 4 亍 Physical Channel). A part of the MAC-e uplink signaling is carried by two newly introduced uplink control channels, and mainly transmits HARQ and auxiliary scheduling related information, and these channels are terminated at the NodeB. It includes E-UCCH (E-DCH uplink control channel) for transmitting E-TFCI and HARQ related information. The E-UCCH information may be transmitted in one or more time slots of the E-DCH and multiplexed with the E-DCH onto a set of E-PUCHs within the TTI. The multiplexing mode of E-UCCH is to use the physical layer indication field. E-RUCCH (E-DCH random access uplink control channel), used to transmit information related to auxiliary scheduling. The E-RUCCH can be mapped to random access physical channel resources and can share some resources with the existing PRACH. The information carried by E-UCCH and E-RUCCH is self-contained in one time slot. The downlink signaling channels E-AGCH (absolute grant channel) and E-HICH (automatic retransmission request response indicator channel) are newly introduced. E-AGCH is used to transmit authorization information; E-HICH is used to carry uplink E-DCH HARQ indication information. The timing relationship of each channel of the HSUPA technology in the above TD-CDMA system is as shown in Figs. 1 to 3, and the E-DCH is always associated with a group of E-AGCH channels and an E-HICH indicator channel. The NodeB scheduler allocates E-DCH transmission resources (slot/code/power:) through the E-AGCH channel; the E-HICH confirms the transmission of the latest E-DCH TTI through the synchronization timing mechanism, as shown in Fig. 1.

The UE needs to determine between the first time slot of the E-AGCH and the subsequent E-DCH TTI. A minimum time interval is used for UE internal processing. This time interval is represented by nE-AGCH, nE-AGCH=6. When receiving the E-AGCH, the UE shall use the first E-DCH resource allocation instance after the current E-AGCH slot is offset by 6 slots, and the resource may be in the current frame or in the next frame, as shown in the figure. 2. A minimum time interval needs to be defined between the last time slot in the E-DCH TTI and the start time slot of the E-fflCH, which is represented by nE-HICH, and the range is between 4 and 44, which is configured by the upper layer. After completing an E-DCH TTI transmission, the UE shall receive an acknowledgment message on the first E-HICH configuration instance after the last time slot in the current E-DCH TTI is cheaper than the nE-HICH, as shown in FIG. Since TD-SCDMA uses low bit rate technology and introduces synchronization technology, the above timing method is not suitable for TD-SCDMA system. In addition, in order to prevent the UE from frequently searching for E-AGCH and reducing the power consumption of the UE, the present invention proposes a new timing relationship of each channel of the HSUPA technology suitable for the TD-SCDMA system. SUMMARY OF THE INVENTION In view of the deficiencies and deficiencies of the prior art, the present invention provides a timing method between channels in a time division code division multiple access system, which can be adapted to the frame structure of TD-SCDMA, avoiding frequent search of the E-AGCH by the UE, and reducing the UE. This makes the resource allocation more flexible and makes full use of resources. In order to achieve the above object, the timing method between channels in the time division code division multiple access system of the present invention includes the following steps.

(1) The scheduling request initiated by the user equipment to the base station ends; (2) After the first minimum time interval, the downlink E-AGCH channel is established between the user equipment and the base station. The scheduling request initiated by the user equipment is a first scheduling request. The method further includes: (3) ending the downlink E-AGCH channel; (4) establishing an uplink E-PUCH channel between the user equipment and the base station after the second minimum time interval. Among them, it also includes:

(5) The uplink E-PUCH channel ends;

(6) After the third minimum time interval, a downlink E-HICH channel is established between the user equipment and the base station. The first minimum time interval ranges from 1 time slot to greater than or equal to 21 time slots. The first minimum time interval is 7 time slots. The second minimum time interval ranges from 3 times to 3 times and 24 times or less. The second minimum time interval is 8 time slots. The third minimum time interval ranges from 3 times to 3 times and 24 times or less. The third minimum time interval is 7 time slots. The invention solves the timing relationship between the channels of the HSUPA technology in the time division code division multiple access system, so that it is suitable for the frame structure of the TD-SCDMA, avoids the UE frequently searching for the E-AGCH, reduces the UE's function, and thus makes the resource allocation more Be flexible and make the most of your resources. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 HARQ timing scheme in TD-CDMA; FIG. 2 Minimum timing relationship of E-AGCH and E-DCH in TD-CDMA; FIG. 3 Minimum timing relationship of E-PUCH and E-HICH in TD-CDMA; 4 Flow chart of each channel relationship of HSUPA in TD-SCDMA; Figure 5 Minimum timing relationship for initiating new scheduling request information, E-AGCH and E-PUCH in TD-SCDMA under different conditions; Figure 6 TD-SCDMA in different cases Minimum timing relationship between E-PUCH and E-HICH. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be further described in detail below with reference to the accompanying drawings. The present invention provides a timing relationship between channels of an HSUPA technology in a time division code division multiple access system. The HSUPA system includes the following channels: HSUPA system physical layer 1 in uplink The E-PUCH physical channel is used by the UE to transmit the CCTrCH of the E-DCH type to the NodeB. E-RUCCH (E-DCH random access uplink control channel), used to transmit information related to auxiliary scheduling. The E-RUCCH can be mapped to a random access physical channel resource and can share some resources with the existing PRACH. The squat signaling channels E-AGCH and E-HICH are newly introduced. The E-HCH is used to transmit the authorization information to the UE by the NodeB, and the E-HICH is used to carry the uplink E-DCH HARQ indication information. The relationship flow of these channels is shown in Figure 4:

(401) The UE initiates an upload request to the NodeB through the E-RUCCH;

(402) the NodeB allocates the code channel resource to the UE by using the E-AGCH according to the content size, the cell capacity, and the interference of the UE;

(403) The UE selects a corresponding rate matching manner, performs processing such as encoding the uploaded data, and uploads data through the E-PUCH.

( 404 ) The NodeB performs ACK/NACK feedback on the uploaded data through the E-HICH. In order to prevent the UE from frequently searching for the E-AGCH and reducing the power consumption of the UE, the present invention proposes to increase the minimum timing T1 (the first minimum time interval) between the scheduling request and the E-AGCH if the UE initiates the scheduling request, as shown in FIG. 5. The relationship is as follows: If the UE initiates the scheduling request for the first time, the process of the UE initiating the E-RUCCH is the same as the PRACH. In order to prevent the UE from frequently searching for the E-AGCH, the power consumption of the UE is reduced, and at the same time, the Node B needs to upload according to the UE. The data size, the cell capacity, and the like are scheduled for the UE, and the radio resource allocation is performed. Therefore, the minimum time interval between the UE requesting the scheduling request information and the E-AGCH is T1. The value of the value is as follows: 1. Ensure that the Node Β has enough time to process the authorization request information, and send the code channel and code channel power information from the E- AGCH to enable the UE to receive correctly. 2. Ensure the UE search cycle. Can not be too frequent, to avoid excessive power consumption; 3, T1 value should not be too large, otherwise it will affect efficiency and reduce the code rate. The value can be determined in two ways: 1. The value range is variable, configured by the upper layer, and notified to the UE and the Node B through system wide or signaling; 2. The value is fixed, the UE and The Node B follows the fixed Tl.

The timing relationship between E-AGCH and E-PUCH is shown in Figure 5:

After receiving the E-AGCH, the UE encapsulates the MAC-es data packet according to the code channel and the time slot resource allocated by the Node B at the MAC-e layer, and performs physical layer processing such as coding. Considering the processing capability of the UE, the minimum time interval between E-AGCH and E-PUCH is T2 (the second minimum time interval;). The value of the value is as follows: 1. Ensure that the UE has enough time to process (such as forming a MAC-e packet, encoding, etc.) after receiving the code channel and time slot resource information allocated by the Node B, and from the E-PUCH. Send, so that Node B receives correctly; 2. The value of T2 should not be too large, otherwise it will affect efficiency and reduce the code rate. The value can be determined in two ways: 1. The value range is variable, configured by the upper layer, and notified to the UE and the Node B through system broadcast or signaling; 2. The value is fixed, and the UE and the Node B comply with the fixed T2.

Ε - The timing relationship between PUCH and E-HICH is shown in Figure 6:

After receiving the E-PUCH, the Node B performs processing such as decoding at the physical layer, and performs unpacking and the like at the MAC-e. According to the result of the CRC (Cyclic Redundancy Check), the received data needs to be received by the E-HICH. The packet does an ACK/NACK response. Considering the processing time of the Node B, the minimum time interval between the E-PUCH and the E-HICH is T3 (the third minimum time interval;). The value of this value is as follows: 1. Ensure that the Node B has enough time to process (such as decoding, CRC check, etc.) after receiving the data packet sent by the UE (in E-PUCH), and ACK or NACK. The E-HICH is sent to enable the UE to receive correctly. 2. The value of T3 cannot be too large. Otherwise, the efficiency will be affected and the code rate will be reduced by 4%. The value can be determined in two ways: 1. The value range is variable, configured by the upper layer, and the UE and the Node B are notified through the system wide or signaling; 2. The value is fixed, and the UE and the Node B comply with the fixed T3. The above timing relationship is applicable to scheduling and non-scheduled services. The present invention will provide a timing relationship between channels of HSUPA technology in a time division code division multiple access system. The following describes the implementation process of the TD-SCDMA system as an example: The timing of the new scheduling request information and the E-AGCH is initiated. If the UE initiates the scheduling request for the first time, the process of the UE initiating the E-RUCCH is the same as the PRACH. To prevent the UE from frequently searching for the E-AGCH, the UE's work is reduced. At the same time, considering that the Node B needs to schedule the UE according to the data size and cell capacity of the UE to apply for uploading, and perform radio resource allocation, the minimum time between the UE to initiate new scheduling request information and E-AGCH The interval is Tl. The value can be determined in two ways: 1. The value range is variable and is configured by the upper layer. The UE and the Node B are notified by the system broadcast or signaling, for example, the value range is Tl e [l, 21] Ts; 2. The value is fixed, and the UE and the Node B comply with T 1 = 7Ts.

Timing relationship between E-AGCH and E-PUCH T2;

After receiving the E-AGCH, the UE encapsulates the MAC-es packet according to the code channel and the daily slot resource allocated by the Node B at the MAC-e layer, and performs physical layer processing such as encoding. Considering the processing capability of the UE, the minimum interval between E-AGCH and E-PUCH is Ts. The value can be determined in two ways: 1. The value range is variable, and is configured by the upper layer to notify the UE and the Node B through system broadcast or signaling, for example, the value range is T2 e [3 , 24] Ts; The value is fixed, and the UE and Node B comply with T2=8Ts.

The timing relationship between the E-PUCH and the HICH is T3; after receiving the E-PUCH, the Node B performs processing such as decoding in the physical layer, performs unpacking processing on the MAC-e, and needs to pass the E-HICH according to the result of the CRC. Make an ACK/NACK response to the received packet. Considering the processing time of Node B, the minimum interval between E-PUCH and E-HICH is T3. The value can be determined in two ways: 1. The value range is variable, configured by the upper layer, and notified to the UE and the Node B through system broadcast or signaling, for example, the value range is T2 e [3, 24] Ts; The value is fixed, and the UE and Node B comply with T3=7Ts.

Claims

A timing method for inter-channel timing in a time division code division multiple access system, comprising: the following steps

(1) the scheduling request initiated by the user equipment to the base station ends;

(2) After the first minimum time interval, a downlink absolute grant channel is established between the user equipment and the base station. The inter-channel timing method in the time division code division multiple access system according to claim 1, wherein: the scheduling request initiated by the user equipment is a first scheduling request. The method for timing between channels in a time division code division multiple access system according to claim 1, further comprising:

(3) The downlink E-AGCH channel ends;

(4) After the second minimum time interval, the user equipment establishes an uplink enhancement between the user equipment and the base station. The method for timing between channels in the time division code division multiple access system according to claim 3 is characterized in that: Includes:

(5) the end of the uplink E-PUCH channel;

(6) After the third minimum time interval, the downlink automatic retransmission request response indication channel is established between the user equipment and the base station. The method for timing between channels in a time division code division multiple access system according to claim 1, wherein: the first minimum time interval ranges from 1 time slot or more to 21 time slots. The method for timing between channels in a time division code division multiple access system according to claim 5, wherein: said first minimum time interval is 7 time slots. The method for timing between channels in a time division code division multiple access system according to claim 3, wherein: the second minimum time interval ranges from 3 time slots or more to 24 time slots. The method for timing between channels in a time division code division multiple access system according to claim 7, wherein: said second minimum time interval is 8 time slots. The method for timing between channels in a time division code division multiple access system according to claim 4, wherein: the third minimum time interval ranges from 3 time slots or more to 24 time slots. The method for timing between channels in a time division code division multiple access system according to claim 9, wherein: said third minimum time interval is 7 time slots.