KR100546592B1 - Method for Transmitting Channel in 3GPP2 - Google Patents

Abstract

The present invention relates to a next generation mobile communication system, and more particularly, to a channel transmission method in a next generation mobile communication system which reduces overhead in transmitting a reverse quality indication and an echo channel of cdma2000 1xtreme. The present invention includes the steps of (a) switching from the first cell to the second cell according to the cell search result of the terminal; (b) the terminal determining the number of packets received from the first cell; (c) when the terminal receives more than 3 packets as a result of determining in step (b), the terminal transmits the transmission information of 2 packets continuously received from the first cell after switching in the step (a). Transmitting to a second cell, but transmitting to the second cell provides a channel transmission method of the next generation mobile communication comprising the step of transmitting the switching time to the start time. According to the present invention, there is an effect of reducing the overhead (time delay) of the base station, which may be generated by the fast cell search method in high-speed packet data transmission.

RQIECH, Dual Channel Hybrid ARQ, R-TSICH

Description

Channel transmission method in next generation mobile communication system {Method for Transmitting Channel in 3GPP2}

1 illustrates adaptive modulation and coding levels in accordance with the present invention.

2 is a diagram illustrating a configuration for a dual channel stop-and-wait hybrid ARQ scheme according to the present invention.

3 illustrates a structure of a reverse power control channel according to the present invention.

4 is a diagram illustrating a method and frame structure for transmitting a uplink sector indicator channel according to the present invention;

5 illustrates a frame structure of a reverse quality indication and an echo channel according to the present invention.

6 illustrates a configuration for forward shared channel transmission according to the present invention.

7 is a diagram illustrating a procedure according to a frame configuration until transmission of a forward shared channel of a base station according to the present invention.

8 illustrates an example of a method of transmitting an RQIECH according to the present invention.

9 illustrates another example of a method of transmitting RQIECH according to the present invention.

The present invention relates to a next generation mobile communication system, and more particularly, to a channel transmission method in a next generation mobile communication system which reduces overhead in transmitting a reverse quality indication and an echo channel of cdma2000 1xtreme.

In general, in the wireless communication environment, the world is making efforts to create a new mobile communication method, IMT-2000 system, to provide wireless users with services such as real-time services (video, voice) and the Internet which are rapidly required. One proposed by this request is 1XTREME. 1XTREME can achieve up to 5.2Mbps transmission speed (downward) while using 1.25MHz width, which is the basic channel of existing CDMA (IS-95A / B / cdma2000 1X), and high-speed packet transmission proposed by Qualmn It is a high-speed packet transmission technology that supports data and voice simultaneously while supporting twice the speed of Data Rate (HDR) method.

The 1xtreme applies a cell switching method that allows high-speed data to be transmitted by a selected cell after high-speed cell search in order to service high-speed packet data. This is because 1xtreme is not suitable for applying soft handover due to large interference of adjacent cells in the forward link signal.

Accordingly, when the serving cell is switched to another cell after such a fast cell search, the corresponding information of the forward shared channel (hereinafter referred to as F-SHCH) transmitted by the serving cell (hereinafter, referred to as F-SHCH) MCS level, ACK packet number information, Walsh code number information) should be informed to the switched cell, which is transmitted through a reverse quality indicator and echo channel (hereinafter referred to as RQIECH). There is a need for a method of transmitting information to be presented in detail. That is, by presenting such a specific method, it is intended to solve a delay time of a system that may be generated by a resource utilization method or a fast cell search method according to the prior art.

Accordingly, an object of the present invention has been made in view of the above-mentioned problems of the prior art, and when a cell switched by a fast cell search procedure receives a retransmission for a packet before switching, the same method as the previous packet is used. An object of the present invention is to provide a method for transmitting packet data in a next generation mobile communication system that transmits data without time delay.

Another object of the present invention is to provide packet data in a next-generation mobile communication system to transmit data with less resources by the same method as a previous packet when a cell switched by a fast cell discovery procedure receives a retransmission for a packet before switching. It is to provide a transmission method.
According to one feature of the present invention for achieving the above object, (a) switching from a first cell to a second cell according to a cell search result of the terminal; (b) the terminal transmits forward shared channel information received from the first cell before switching in step (a) and transmission information of two packets continuously received from the first cell after switching in step (a). Characterized in that it comprises the step of transmitting to two cells.
The forward shared channel information is information including MCS information, ACK packet sequence number, and Walsh code number.
In the step (b), when the terminal transmits packet transmission information to the second cell, the information is preferably included in a reverse quality indicator and an echo channel and transmitted.
The present invention also includes the steps of: (a) switching from the first cell to the second cell according to the cell search result of the terminal; (b) the terminal determining the number of packets received from the first cell; (c) when the terminal receives more than 3 packets as a result of determining in step (b), the terminal transmits the transmission information of 2 packets continuously received from the first cell after switching in the step (a). Transmitting to a second cell, but transmitting to the second cell provides a channel transmission method of the next generation mobile communication comprising the step of transmitting the switching time to the start time.

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Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

1xtreme utilizes an adaptive antenna, adaptive coding and modulation scheme, and adaptive hybrid ARQ scheme to transmit high-speed packet data and voice in real time. Shown in In the following description, a cell is used interchangeably with the same meaning as a base station (BTS).

1 is a diagram illustrating an adaptive modulation and coding level according to the present invention.

Adaptive Modulation and Coding (abbreviated as AMC) refers to the process of link matching technology that modifies the transmitted signal to compensate for signal changes. The technique is representative.

The forward fast power control scheme is not as effective as the reverse link because of its limited fluidity, which increases interference between different cells in high speed data transmission. Therefore, in the forward link, the AMC technique is more easily used for transmitting high-speed data than the fast power control technique. The AMC technique is used for a forward shared channel (hereinafter, referred to as F-SHCH) for transmitting a high-speed packet. do. The AMC scheme selects a modulation coding scheme (hereinafter, referred to as MCS) based on channel conditions. The AMC measures pilot power transmitted from a cell in an active set every 5 ms. This measurement information is informed to the base transceiver station (hereinafter abbreviated as BTS) so that the BTS selects one of the MCS levels shown in FIG. 1, generates packet data according to the selected MCS level, and transmits to the corresponding mobile station. To transmit.

2 is a diagram illustrating a configuration for a dual channel stop-and-wait hybrid ARQ scheme according to the present invention.

The single stop-and-wait ARQ protocol has the advantage of requiring little overhead, but at the expense of wasting system capacity. Complementing this is the dual channel stop-and-wait hybrid ARQ method, which is a queue 101 for storing packets received from the network as shown in FIG. Dual channel sequence 102 for multiplexing and outputting even or odd packets and an acknowledgment (hereinafter referred to as ACK) or non-acknowledgement signal (hereinafter referred to as NACK) for the even packet An even transmitter 103 for transmitting the packets to the network that transmitted the packets, an odd transmitter 104 for transmitting an acquisition (ACK) signal or a non-acquisition signal (NACK) signal for the odd packets to the network that transmitted the packets; A data channel 105 for delivering data provided from the even transmitter 103 or the odd transmitter 104 to each receiver 106, 107, and each receiving packets from the data channel 105. Can consist of a receiver 106 and odd receiver 107, the receiver of each of the even hybrid ARQ decoder 108 and odd hybrid ARQ decoders 109 for decoding the packet transmitted from the (106 107).

With this configuration, packets received from the network side are stored in the queue 101 and multiplexed into even or odd packets by the dual channel sequencer 102. The even packets pass through the even transmitter 103, the data channel 105, the even receiver 106, and the even hybrid ARQ decoder 108 to decode the data contained in the packet, and to decode the decoded data. Depending on the degree of error, the even hybrid ARQ decoder 108 provides an ACK or NACK signal to the even transmitter 103 via an even feedback channel. In addition, the odd packets are passed through the odd transmitter 104, the data channel 105, the odd receiver 107, and the odd hybrid ARQ decoder 109 to decode the data contained in the packet, Depending on the error degree of the data, the odd hybrid ARQ decoder 109 provides the ACK or NACK signal to the odd transmitter 104 via the odd feedback channel. Thus, even transmitter 103 sends E (even) -ACK or E (even) -NACK, and odd transmitter 104 sends O (odd) -ACK or O (odd) -NACK to the network side where the packets were sent. Will be sent. In this case, the data channel 105 is divided into odd and even time slots to apply independent stop-and wait ARQ protocols, and the odd and even states of time slots must be accurately signaled by the control channel. You must do it.

3 is a diagram illustrating a structure of a reverse power control channel according to the present invention.

Information on the ACK or NACK according to the dual channel hybrid ARQ technique used in the present invention is made through a Reverse Acknowledgment Indicator Channel (hereinafter, abbreviated as R-AICH), as shown in FIG. The channel is multiplexed with a power control channel (hereinafter, referred to as PCCH) and transmitted. That is, the power control bit or the ACK indication bit is repeated by (48x factor) by each symbol repeater 201 and 202 and multiplexed by the multiplexer 203 and output. The multiplexed bits are transmitted through each of the Acknowledgment Indicator Channel (AISCH) field and the Power Control (PC) field, each of which consists of a Power Control Group (hereinafter, abbreviated as PCG) length.

For reference, DTX indicates a discontinuous transmission field.

4 is a diagram illustrating a method and a frame structure for transmitting a uplink sector indicator channel according to the present invention.

As described above, since 1xtreme causes additional interference in the uplink in the case of soft handoff, the mobile station is active by using fast cell site selection (hereinafter abbreviated as FCSS) technique instead of the soft handoff. By selecting a cell having the best channel condition among the cells included in the set, information on the cell is informed to the corresponding cell (a cell newly selected by the fast cell search) to select an optimal cell.

This fast cell site selection allows the mobile station to measure the pilot power of the cells in the active set every frame (5ms), selects the cell in the best condition, and then selects this cell as a base transceiver subsystem (hereinafter referred to as BTS). This is how you select a cell by telling its information. At this time, the information of the cell selected by the mobile station is transmitted to the BTS by the Reverse Transmitter Sector Indicator Channel (hereinafter, referred to as R-TSICH), as shown in FIG. The last 256 pilot channels per power control group (hereinafter abbreviated as PCG) are masked (by multiplexers) with the Walsh code of the selected cell and transmitted. The Walsh code is a single Walsh code defined for each cell, and these codes are selected from 256 Walsh codes.

Therefore, when the mobile station switches to the selected cell, it should inform the new cell of the MCS level, the multi-code number, and the packet number that are currently applied to the serving cell. At this time, such information is transmitted to a newly selected cell in the mobile station through a reverse quality indicator and echo channel (hereinafter, referred to as RQIECH).

5 illustrates a frame structure of a reverse quality indication and an echo channel according to the present invention.

The RQIECH is a sequence number of MCS and packet data of a forward shared channel (hereinafter abbreviated as F-SHCH) transmitted to the mobile station before switching to the new cell when the serving cell is switched to the new cell. QWK, 8-PSK, 16QAM and 64QAM modulation schemes, 1/2 and 3/4 turbo code rates, and 15 multipliers with fixed spreading factor (SF) The channel is supported by code. As shown in FIG. 5, the F-SHCH channel includes an information bit field, an F field including a frame quality indicator (CRC), and an encoder tail bit field.

6 is a diagram illustrating a configuration for forward shared channel transmission according to the present invention.

Referring to FIG. 6, each CRC bit block 301, tail bit block 302, and CRC for adding a cyclic redundancy code (hereinafter referred to as CRC) and tail bits to a packet data source, A turbo encoder 303 for channel coding of a packet data source with bits and tail bits added therein; a rate matching 304 for symbol repetition and puncturing so that the bit rate of the channel coded data is matched to the physical layer; A block interleaver 305 for interleaving the matched data, an M-QAM & PSK 306 for modulating the interleaved data with M-QAM or PSK, and a multiplier for multiplying this modulated signal by 1 or -1 313, a serial-to-parallel converter 307 for outputting the output signal of the multiplier 313 in parallel with the signal of another user, the turbo encoder 303, rate matching 304, and M-ary QAM & PSK 306 code rate or symbol repetition of each An MCS rate change controller 308 for controlling a factor or M-value, a long code generator 309 for generating a long code for each user, and successive bits of I and Q from the generated long code, respectively. A scrambling bit extractor 310 for extracting a scrambling bit, a scrambling bit repetition block 311 for repeating the extracted scrambling bit, and a value of the repeated bits are mapped to 1 or -1 to the multiplier 313. It provides a signal mapper 312.

The packet data source to be transmitted through the F-SHCH transmitted by such a configuration includes a CRC bit for error checking, a tail bit indicating the end of the data source, and a CRC bit block 301 and a tail bit. It is added by the block 302 and channel coded by the turbo encoder 303 into a turbo code with strong error correction capability. At this time, the code rate of the turbo encoder 303 is controlled by the MCS rate change controller 308. The bit rate of this channel coded data is converted to a bit rate supported by the system by the rate matching block 304, wherein the coded data is matched by symbol repetition or puncturing, and the block interleaver ( 305 to allow for improved recovery against burst errors. MCS rate change controller 308 changes the rate of turbo encoder 303 or rate matching 304 or M-QA & PSK 306 according to the MCS level shown in FIG. Finally, this interleaved data is modulated by M-QAM or PSK by M-QAM & PSK 306, multiplied by a scrambling code mapped to 1 or -1, and output in parallel with the data of other users. Is sent.

7 is a diagram illustrating a procedure according to a frame configuration until transmission of a forward shared channel by a base station according to the present invention.

Referring to FIG. 7, the mobile station first selects an optimal BTS by measuring the pilot power transmitted from the BTSs in the active set, and the second frame time indicates that the mobile station transmits the selected BTS information through the R-TSICH. In the third frame time, the newly selected BTS determines the MCS level and schedule of the F-SHCH to transmit in the next frame with the pilot power measurement information received from the mobile station. At the fourth frame time, timing is performed in the form of transmitting the F-SHCH according to this determined schedule.

The channel transmission algorithm considering the transmission timing of the F-SHCH channel and the dual channel hybrid ARQ scheme described in FIG. 7 is shown in FIG. 8.

The fast cell site selection (FCSS) method works in conjunction with the dual channel hybrid ARQ protocol. Since the high speed packet data is transmitted, the delay due to the ARQ protocol needs to be reduced, so the 1XTREME system applies the ARQ protocol used in the physical layer. By doing so, the ARQ protocol runs at the base station controller (abbreviated as BSC) to the BTS, reducing the delay for retransmission, but the switched cell does not know how much sequence has been transmitted from the previous cell. . Therefore, the mobile station that received the packet from the previous BTS must inform the received packet sequence number to the switched cell through the RQIECH. In addition, the newly selected BTS determines the MCS level based on the pilot power measurement information received from the mobile station and transmits the F-SHCH. If the mobile station requests the switched cell to retransmit the packet transmitted from the BTS before switching. At that time, the switched cell must know the MCS level of the packet transmitted in the previous cell to retransmit the packet to the mobile station with the same MCS. Therefore, when switching to a new cell occurs, the mobile station must inform the switched cell of the MCS information and Walsh code information of the F-SHCH transmitted in the previous cell.

8 is a diagram illustrating an example of a method of transmitting an RQIECH according to the present invention.

Referring to FIG. 8, packet 2 is transmitted in BTS # 4 by BTS # 4 first selected by a reverse transport sector indicator channel (R-TSICH), and number 3 in BTS # 4 by second selected BTS # 4. The packet is transmitted, and packet number 2 is retransmitted in BTS # 3 by the third selected BTS # 3. Where BTS # 1. BTS # 3 and BTS # 4 are cells included in the active set.

When switching from BTS # 4 to BTS # 3 by the R-TSICH, an example in which a mobile station transmits an RQIECH to BTS # 3 will be described. When the mobile station is switched after receiving three or more packets consecutively in BTS # 4 before switching, the mobile station transmits the MCS information of the F-SHCH and the ACK packet sequence number received from the BTS # 4 before switching to the switched BTS # 3. In this case, it is necessary to inform Walsh code number information and information of two packets received in succession after the switching. When the mobile station switches after receiving two packets consecutively in the BTS before switching, the mobile station transmits the packet information of the F-SHCH received immediately before switching from the BTS before the switching occurrence and the packet information received after the switching to the switched BTS. You have to tell. When switching occurs after a packet is transmitted to the mobile station, only the MCS information, the ACK packet sequence number, and the Walsh code number information of the packet received before the switching need be reported.
Since the RQIECH transmission scheme shown in FIG. 8 includes unnecessary information, overhead is increased. That is, when switching to a new cell, when receiving two or less packets continuously in the cell before switching, the mobile station transmits the packet information of the received F-SHCH to the switched cell through the RQIECH before switching. However, when switching to a new cell, if three or more packets are continuously transmitted in the cell before switching, the packet information of the F-SHCH transmitted by the RQIECH by the mobile station after switching becomes unnecessary information.
9 is a diagram illustrating an example of a method of transmitting RQIECH that can reduce overhead according to the present invention.

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Referring to FIG. 9, since switching has occurred from the first BTS # 4 to the BTS # 3, and no switching occurs more than 3 packets in the BTS # 4, the mobile station transmits the first packet received from the BTS # 4, the packet information before the switching. The corresponding information is not sent (first X on the RQIECH in FIG. 9), and only information corresponding to packets 2 and 3 received in succession after switching is sent to the RQIECH. When switching from BTS # 3 to BTS # 1 for the second time, switching of more than 3 packets has not occurred in BTS # 3. Therefore, information about packet 4 received in BTS # 3 is not transmitted (second X on RQIECH in FIG. 9). ) Transmit only information about packet 3 to RQIECH.
In the third switch from BTS # 1 to BTS # 3, since switching occurs after 2 packets in BTS # 1, the mobile station transmits information on 5 packets, that is, information of received packets, to RQIECH before switching. In addition, when BTS # 3 switches from BTS # 3 to BTS # 4 for the fourth time, since switching occurs after 1 packet in BTS # 3, information of 6 packets and information of 5 packets transmitted from BTS # 1, which is the information of the received packet before switching And 6 packet information of BTS # 3 are transmitted to RQIECH.
In the embodiment of the present invention, the transmission to the base station is taken as an example, and a method of transmitting sector and packet data instead of the base station is possible.

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As described above, the present invention has the effect of reducing the overhead (time delay) of the base station that may be generated by the fast cell search method in the high-speed packet data transmission. In addition, the cell selected by the fast cell search method has an effect of retransmitting data under the same condition as a packet previously transmitted with less resources.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the examples, but should be defined by the claims.

Claims (5)

(a) switching from a first cell to a second cell according to a cell search result of the terminal; (b) the terminal transmits forward shared channel information received from the first cell before switching in step (a) and transmission information of two packets continuously received from the first cell after switching in step (a). Channel transmission method of the next generation mobile communication comprising the step of transmitting to two cells. The method of claim 1, The forward shared channel information is MCS information, ACK packet sequence number and Walsh code number, characterized in that the channel transmission method of the next generation mobile communication. The method of claim 1, In the step (b), when the terminal transmits packet transmission information to the second cell, the information is included in a reverse quality indicator and an echo channel and transmitted. Transmission method. (a) switching from a first cell to a second cell according to a cell search result of the terminal; (b) the terminal determining the number of packets received from the first cell; (c) when the terminal receives more than 3 packets as a result of determining in step (b), the terminal transmits the transmission information of 2 packets continuously received from the first cell after switching in the step (a). And transmitting to a second cell, wherein the time of transmitting to the second cell comprises transmitting a switching time as a start time. The method of claim 4, wherein In step (c), when the terminal transmits packet transmission information to the second cell, the information is included in a reverse quality indicator and an echo channel and transmitted. Transmission method.

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