KR100662267B1 - Method for Allocating CPCH and Apparatus for Transmitting/Receiving to Receive Packet through CPCH - Google Patents

Abstract

The present invention relates to the next generation mobile communication, and in particular, common packet channel (CPCH) between a plurality of UE (UE) and a base station (BS) by detecting and eliminating collision of common packet channel (CPCH) when allocating common packet channel (CPCH). ), And a method for allocating a common packet channel (CPCH), which is suitable for efficiently allocating The method of allocating a common packet channel (CPCH) according to the present invention includes the steps of requesting allocation of a common packet channel (CPCH) to a base station (BS) by a plurality of UEs, and the base station (BS) according to the request. ) Selects a specific user side (UE) and transmits a response signal to the selected user side (UE), transmission interval and transmission control of a power control preamble (PC Preamble) between the selected user side (UE) and the base station (BS) Performing collision detection and collision cancellation of the requested common packet channel (CPCH) using any one of the periods after the transmission of the preamble; collision detection and collision cancellation of the common packet channel (CPCH); Thereafter, the selected user side (UE) comprises the step of transmitting a message, the step of performing a collision detection and collision cancellation process for the common packet channel (CPCH), the selected user side (UE) Selecting an arbitrary first code from the predetermined number of Hadamard codes, and transmitting collision information composed of the selected first code to the base station BS, and the base station BS is selected by the user side Selecting any one of the collision information transmitted in (UE), and transmitting the collision elimination information composed of the second code one-to-one correspondence with the first code to the corresponding user side (UE) which has transmitted the selected collision information. Is done.

Next Generation Mobile Communications, Common Packet Channel (CPCH)

Description

A method for allocating a common packet channel and a base station transceiver for receiving a packet through a common packet channel {Method for Allocating CPCH and Apparatus for Transmitting / Receiving to Receive Packet through CPCH}

1 is a view showing the overall structure of a common packet channel (CPCH) for explaining a conventional method of allocating a common packet channel (CPCH).

2 is a diagram showing the overall structure of a common packet channel (CPCH) for explaining a conventional method of allocating a common packet channel (CPCH).

3 is a view for explaining a method of allocating a common packet channel (CPCH) according to a first embodiment of the present invention.

4 is a view for explaining a method of allocating a common packet channel (CPCH) according to a second embodiment of the present invention.

5 to 7 are diagrams for explaining the transmission interval of the SCD code and SCDI code in accordance with the present invention.

8A to 8C illustrate a mapping structure of SCDI codes according to the present invention.

9A to 9E are diagrams illustrating a mapping structure of an SCD code according to the present invention.

10 is a diagram illustrating a mapping structure of an SCDI code and an SL code according to the present invention.

11 is a block diagram illustrating a transmitter / receiver of a base station (BS) according to the present invention.

* Description of the symbols for the main parts of the drawings *

100: rake receiver 110: switch unit

120: data decoding unit 130: Hadamard decoder

140: code determination unit 150: Hadamard encoder

160: data encoding unit

The present invention relates to the next generation mobile communication, and in particular, common packet channel (CPCH) between a plurality of UE (UE) and a base station (BS) by detecting and eliminating collision of common packet channel (CPCH) when allocating common packet channel (CPCH). ), And a method for allocating a common packet channel (CPCH), which is suitable for efficiently allocating

Recently, the ARIB and TTC in Japan, the ETSI in Europe, the T1 in the US, and the TTA in Korea have recently introduced the Third Generation Partnership Project (hereinafter abbreviated as 3GPP) to establish technical standards for next-generation mobile communication systems. Configured.

In the research section of the 3GPP research on the global radio access network (UTRAN) describes the definition and description of the transport channel (Physical channel) and the physical channel (Physical channel).

The common packet channel (CPCH), which is one of the transmission channels, transmits relatively long data from the user side (UE) to the base station (BS) through the uplink (Up-Link, UL). Assigned between (UE). In this case, the uplink (UL) common packet channel (CPCH) is related to a dedicated channel (DCH), which is a channel for performing Close Loop Power Control, and the dedicated channel (DCH) is a physical channel. It is mapped to a dedicated physical control channel (DPCCH). The common packet channel (CPCH) is allocated with several UEs using a random access scheme.

On the other hand, it should be noted that the allocation of the common packet channel (CPCH) of the common packet channel (CPCH) that occurs when a plurality of UE (UE) requests the allocation of the same common packet channel (CPCH) to the base station (BS) Collision phenomenon.

Currently, 3GPP proposes two methods described below as a method for efficiently allocating the common packet channel (CPCH) by reducing the collision of the common packet channel (CPCH).

FIG. 1 is a diagram illustrating an overall structure of a common packet channel (CPCH) for explaining a conventional method of allocating a common packet channel (CPCH). (See 3GPP TSGR1 # 5 (99) 592 Golden Bridge Technology, "CPCH Physical Layer Procedures.")

Referring to FIG. 1, the conventional process of allocating a common packet channel (CPCH) can be described by dividing it into four parts.

The first is a power ramping process in which the power of a transmission signal is adjusted to a level that can be received by the base station BS at the UE.

That is, the power ramping process is a process in which a UE transmits an access preamble (hereinafter, abbreviated as AP), and an access preamble acquisition indication channel (Access) which is a response signal to an AP from a base station BS. A Preamble Acquisition Indication Channel (hereinafter abbreviated as AP-AICH) is transmitted. In this case, the AP is composed of one of a signature set or a spreading code set consisting of 16 Hadamard codes, and the AP-AICH is a code that corresponds one-to-one with the AP, that is, It consists of one code of a symbol set, a spreading code set, or a channelization code set consisting of 16 Hadamard codes.

The power ramping process will be described in more detail. First, the UE selects one of the current common common channel channels (CPCH), and then selects one code among 16 Hadamard codes as an AP symbol. Configure and transmit to the base station (BS). In addition, the UE UE repeatedly increases the power of the AP at a predetermined cycle until the AP-AICH, which is a response signal to the AP transmitted from the base station BS, is transmitted.

Then, the base station (BS) determines the user side (UE) to allocate a common packet channel (CPCH) after receiving each AP transmitted from the various user (UE). The base station BS transmits the AP-AICH composed of a signature corresponding to the AP transmitted from the selected user side UE to the corresponding UE. Each UE receives an AP-AICH and compares the AP-AICH with an AP transmitted by the UE. The UE determines that the UE is selected. At this time, the UE, which is not selected, starts the power ramping process from the beginning.

The second is a collision that may occur when multiple UEs simultaneously request the same common packet channel (CPCH) allocation, that is, when multiple UEs simultaneously receive the AP-AICH using the same AP. (Collision) is a process of reducing the UE (Collision Detection Preamble, abbreviated to CD-P) and the base station (BS) is a response signal to the CD-P CD -AICH is transmitted. At this time, the CD-P is composed of one code selected from the symbol group and the other symbol group or spreading code group using the AP, CD-AICH is a symbol group, spreading code group or channelization code group consisting of 16 codes It consists of one code that corresponds one-to-one with the CP-P.

The collision reduction process of the common packet channel (CPCH) will be described in more detail. First, one or more UEs that have received the AP-AICH composed of the same symbols as the APs that they transmit receive 16 different symbols. One symbol is selected from among them, and the CD-P composed of the selected symbol is transmitted to the base station BS. The base station BS then receives the CD-Ps transmitted from one or more user-sides (UEs) and then transmits the CDs to prevent the same common packet channel (CPCH) being assigned to the multiple user-sides (UEs) accordingly. -Select any one of -P and transmit the CD-AICH composed of symbols that correspond one-to-one with the CD-P to the corresponding UE. The common packet channel CPCH is allocated between the user equipment UE and the base station BS having received the CD-AICH from the base station BS.

The third process is to initialize Close Loop Power Control (CL-PC) of the common packet channel (CPCH) allocated to the UE through the Dedicated Physical Control Channel (DPCCH). The base station (BS) consists of a process of transmitting the CL-PC preamble through the uplink and downlink to each other. Here, the CL-PC preamble includes pilot information for estimating channel state, transmit power information (hereinafter, abbreviated as TPC) information and dummy data for CL-PC. In the uplink, dummy data is transmitted through a dedicated physical data channel (DPDCH) of I stage, and pilot information and TPC information are transmitted through a dedicated physical control channel (DPCCH) of Q stage. In the downlink, a dedicated physical control channel (DPCCH) and a dedicated physical data channel (DPDCH) are time-divided to transmit pilot information, TPC information, and dummy data.

When the initialization process of the closed loop power control is described in more detail, first, the corresponding UE receives a CD-AICH having the same symbol as the CD transmitted by the BS from the BS to the BS. Send the emblem and the other user side (UE) resumes the initial power ramping process. At this time, the base station (BS) also transmits a PC preamble to the user side (UE) like the user side (UE) to perform the initialization of the closed loop power control.

Fourth, a process of transmitting a message through a common packet channel (CPCH) allocated on the user side (UE). Packet data, a pilot through the assigned common packet channel (CPCH) on the user side (UE). The information and the TPC information are transmitted to the base station (BS), and the base station (BS) transmits pilot information and TPC information for closed loop power control to the user side (UE) through a downlink dedicated physical control channel (DPCCH).

In the process of allocating the common packet channel (CPCH) described above, CD-P and CD-AICH are used before the PC preamble transmission interval in order to prevent a plurality of UEs from allocating the same common packet channel (CPCH). The collision detection and collision cancellation process of the common packet channel (CPCH) is performed.

2 is a diagram illustrating the overall structure of a common packet channel (CPCH) for explaining a conventional method of allocating a common packet channel (CPCH). (See 3GPP TSGR1 # 4 (99) 371 Golden Bridge Technology, "Procedures Associated with Access and Operation of UL CPCH and the Associated DLDCCH."

Referring to FIG. 2, in the method of allocating a common packet channel (CPCH) illustrated in FIG. 2, collision detection and collision cancellation of the common packet channel (CPCH) are performed after the PC preamble transmission interval.

That is, in the collision detection process of the common packet channel (CPCH), a random number is transmitted from the UE to the base station BS after the PC preamble transmission process, and the base station BS transmits a random number to the common packet channel CPCH. After selecting a user side (UE) to be allocated, the same random number is transmitted to the corresponding user side (UE). At this time, the UE (UE) inserts and transmits a random number in the CD field transmitted after PC preamble transmission, and the base station (BS) is a random number of the UE (UE) selected in the Node B Collision Detection (NB-CD) field Insert and send.

Then, the corresponding UE receives the random number transmitted from the base station BS and transmits the packet data through the assigned common packet channel CPCH.

However, this conventional common packet channel (CPCH) allocation method has the following problems.

First, the conventional common packet channel (CPCH) allocation method increases the probability that a collision occurs when a plurality of UEs require allocation of the same common packet channel (CPCH), and accordingly the common packet channel (CPCH) efficiently Cannot be assigned.

Second, the conventional common packet channel (CPCH) allocation method uses a CD preamble and a CD-AICH to detect and eliminate a collision of a common packet channel (CPCH), thereby causing additional delay and thus system performance. Is lowered.

Accordingly, an object of the present invention has been made in view of the above-mentioned problems of the prior art, and when a plurality of UEs require allocation of the same common packet channel (CPCH), collision of the common packet channel (CPCH) is avoided. The present invention provides a method for allocating a common packet channel (CPCH) that can be efficiently allocated by reducing the common packet channel (CPCH).

According to an aspect of the present invention for achieving the above object, a method for allocating a common packet channel (CPCH) is a step in which a plurality of UE (UE) request the allocation of a common packet channel (CPCH) to the base station (BS) And selecting, by the base station BS, a specific user side UE according to the request, and transmitting a response signal to the selected user side UE, and a power control preamble between the selected user side UE and the base station BS. Performing a collision detection and collision cancellation process of the requested common packet channel (CPCH) using any one of a transmission interval of a PC preamble and a transmission interval of a transmission control preamble, and the common packet After the collision detection and collision elimination process of the channel (CPCH) comprising the step of transmitting a message by the selected user side (UE), the collision detection and collision elimination process for the common packet channel (CPCH) The performing may include selecting, by the selected UE, a random first code from a predetermined number of Hadamard codes, and transmitting collision information including the selected first code to the base station BS; The base station BS selects any one of the collision information transmitted from the selected user side UE, and transmits the selected collision information to the corresponding user side UE that has transmitted the selected collision information. And transmitting the collision elimination information configured.

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

According to the present invention, when requesting allocation of the same common packet channel (CPCH) from a plurality of UEs to a base station (BS), the common packet channel (CPCH) improves system performance by reducing the collision of the common packet channel (CPCH). We propose a method of allocation.

To this end, in the present invention, the collision detection and collision cancellation process of the common packet channel (CPCH) during the transmission period of the power control preamble (PC Preamble) or after the transmission period of the power control preamble (PC Preamble) during initialization of the closed loop power control Do this. At this time, the collision information is transmitted between the UE and the BS so as to reduce the collision of the common packet channel CPCH. The collision information is an SCD code (Secondary Collision Detection Code) and a SCDI code (Secondary Collision Detection Indicator Code), and the SCD and SCDI codes are transmitted through a dedicated physical channel.

First embodiment

3 is a diagram for explaining a method of allocating a common packet channel (CPCH) according to a first embodiment of the present invention.

Referring to FIG. 3, in the first embodiment, a collision detection and collision cancellation process of a common packet channel (CPCH) is performed during a transmission period of a power control preamble (PC preamble) during initialization of closed loop power control. The allocation method of CPCH will be described.

First, the plurality of UEs and the BS perform a power ramping process. Accordingly, a plurality of UEs select one of common packet channels (CPCHs) that are not currently used, and then select one code among 16 Hadamard Code codes and access them to an access preamble (AP). Symbol) and transmit it to BS. In addition, the plurality of UEs repeatedly increase the power of the AP at a predetermined period until the AP-AICH, which is a response signal to the access preamble (AP) transmitted from the base station (BS), is repeatedly transmitted until a threshold number of times.

Then, the base station (BS) selects the user side (UE) to allocate a common packet channel (CPCH) from each access preamble (AP) transmitted from the various user side (UE). In addition, the base station BS transmits the AP-AICH composed of signatures corresponding to the selected access preamble AP to the corresponding UE. At this time, each UE receives the AP-AICH and compares it with the access preamble (AP) transmitted by the UE, and then knows that the UE is selected. At this time, the UE (UE) that has not been selected first starts the power ramping process. Start again.

Subsequently, the user side (UE) receiving the AP-AICH transmits a collision detection preamble (CD-P) to the base station (BS), and the base station (BS) is one user side (UE) to allocate a common packet channel (CPCH) ), And transmits the CD-AICH, which is a response signal to the collision detection preamble (CD-P), to the corresponding UE. In this case, the CD-P and the CD-AICH transmitted between the BS and the UE are optional.

Subsequently, at the user side (UE), the collision indicating the allocation of the same common packet channel (CPCH) in order to reduce the collision of the common packet channel (CPCH) during the transmission interval of the power control preamble (PC Preamble) during the initialization of the closed loop power control Information is transmitted to a base station (BS) via a dedicated physical channel (DPCH). In this case, the collision information is composed of SCD codes (Secondary Collision Detection Code), and the SCD codes are composed of 16 16 length Hadamard codes.

Then, after receiving the collision information transmitted from each user side (UE), the base station (BS) selects one user side (UE) to which the common packet channel (CPCH) is assigned, and the SCDI code (Secondary Collision) corresponding one-to-one with the SCD code. Detection Indicator Code) is transmitted to the selected UE. The SCDI code here consists of 16 16 length Hadamard codes.

The UE receives the SCDI code that has one-to-one correspondence with the SCD code transmitted from the base station BS and transmits the packet data through the allocated common packet channel (CPCH) after the power control preamble (PC Preamble) transmission. To start.

On the other hand, the UE (UE), which has not received the SCDI code one-to-one corresponding to the SCD code transmitted from the base station BS, is executed again from the power ramping process.

Second embodiment

4 is a diagram for explaining a method of allocating a common packet channel (CPCH) according to a second embodiment of the present invention.

Referring to FIG. 4, in the second embodiment, a method of allocating a common packet channel (CPCH) that performs collision detection and collision cancellation of a common packet channel (CPCH) after a transmission interval of a power control preamble (PC Preamble) will be described. do.

First, the plurality of UEs and the BS perform a power ramping process. Accordingly, a plurality of UEs select one of common packet channels (CPCHs) that are not currently used, and then select one code among 16 Hadamard Code codes and access them to an access preamble (AP). Symbol) and transmit it to BS. In addition, the plurality of UEs repeatedly increase the power of the AP at a predetermined period until the AP-AICH, which is a response signal to the access preamble (AP) transmitted from the base station (BS), is repeatedly transmitted until a threshold number of times.

Then, the base station (BS) selects a user side (UE) to allocate a common packet channel (CPCH) from each of the access preamble (AP) transmitted from the various user side (UE). In addition, the base station BS transmits the AP-AICH composed of signatures corresponding to the selected access preamble AP to the corresponding UE. At this time, each user side (UE) receives the AP-AICH and compares it with the access preamble (AP) transmitted by the user knows that it is selected, the user side (UE) is not selected at this time power ramping from the beginning Start over.

Subsequently, the user side (UE) receiving the AP-AICH transmits a collision detection preamble (CD-P) to the base station (BS), and the base station (BS) is one user side (UE) to allocate a common packet channel (CPCH) ), And transmits the CD-AICH, which is a response signal to the collision detection preamble (CD-P), to the corresponding UE. In this case, the CD-P and the CD-AICH transmitted between the BS and the UE are optional.

Subsequently, the user side (UE) receives collision information indicating allocation of the same common packet channel (CPCH) to reduce the collision of the common packet channel (CPCH) after transmission of the power control preamble (PC Preamble) to the dedicated physical channel (DPCH) Through the base station (BS) to transmit. In this case, the collision information is composed of SCD codes, and the SCD codes are composed of 16 16 length Hadamard codes.

Then, the base station (BS) receives the collision information transmitted from the user side (UE), and then selects one user side (UE) to allocate a common packet channel (CPCH) to the SCDI code corresponding to the SCD code one-to-one ( UE). The SCDI code here consists of 16 16 length Hadamard codes.

Receiving the SCDI code one-to-one corresponding to the SCD code transmitted by the base station BS, the corresponding UE starts to transmit packet data through the assigned common packet channel (CPCH) and fails to receive the SCDI code. The UE performs again from the power ramping process.

On the other hand, the SCD code and the SCDI code described in the first and second embodiments are composed of 16 Hadamard codes as shown in Table 1 below.

5 to 7 are diagrams for explaining the transmission interval of the SCD code and SCDI code according to the present invention.

Referring to FIG. 5, FIG. 5 illustrates a case in which a spread rate SF of a downlink dedicated physical control channel (DL-DPCCH) is 256 and a SCDI code transmitted by a base station (BS) is transmitted once during two slots. Indicated. At this time, the SCD code transmitted by the UE (UE) is repeatedly transmitted for 10 slots.

Referring to FIG. 6, FIG. 6 is a case in which the SFDI of the downlink dedicated physical control channel (DL-DPCCH) is 256, and the SCDI code transmitted by the base station BS is repeatedly transmitted twice during 4 slots. Indicated. At this time, the SCD code transmitted from the UE (UE) is repeatedly transmitted for 8 slots.

Referring to FIG. 7, FIG. 7 illustrates a case in which the SCDI code transmitted by the base station BS is transmitted once during 4 slots when the SF of the downlink dedicated physical control channel (DL-DPCCH) is 512. It was. At this time, the SCD code transmitted from the UE (UE) is repeatedly transmitted for 8 slots.

As described above, in the transmission interval of the SCD code and the SCDI code shown in FIGS. 5 to 7, a power control preamble (PC Preamble) is configured with a total of 15 slots, and the base station BS receives the SCD code to transmit the SCDI code. It is determined considering that the time required until 2 slots and the time required for the UE to receive the SCDI code and transmit packet data through the common packet channel (CPCH) are 1 slot.

Therefore, the SCD code and the SCDI code have a transmission interval as shown in Table 2 according to a given condition.

(Unit: slot) rescue Transmission time of the SCD code Time between SCD code and SCDI code Transmission time of the SCDI code Transmission time between SCDI code and packet data A 10 2 2 One B, C 8 2 4 One D 10 One 2 2 E 8 One 4 2 F 9 3 2 One G 7 3 4 One H 8 3 2 2 I 8 3 4 2

8A to 8C are diagrams illustrating a mapping structure of an SCDI code according to the present invention.

Referring to FIG. 8A, FIG. 8A illustrates a case in which an SF of a downlink dedicated physical control channel (DL-DPCCH) is 256 and an SCDI code is transmitted once for two slots.

This means that when SF is 256, since one slot is composed of 10 bits, two slots are required to transmit a 16-bit SCDI code. Accordingly, the first 8 bits of the 16-bit SCDI code are inserted into the first slot and transmitted. The second 8 bits are inserted into the second slot and transmitted.

In this case, the SCDI code is inserted into a data field of a downlink dedicated physical control channel (DL-DPCCH) and transmitted.

Referring to FIG. 8B, FIG. 8B illustrates a case in which the SF of the downlink dedicated physical control channel (DL-DPCCH) is 256 and the SCDI code is repeatedly transmitted two times during four slots.

As described with reference to FIG. 8A, when SF is 256, since one slot is composed of 10 bits, four slots are composed of 40 bits. Therefore, the 16-bit SCDI code is transmitted once for two slots and the same SCDI code is repeatedly transmitted for the remaining two slots. In this case, as described with reference to 8a, the SCDI code is inserted into the data field of the downlink dedicated physical control channel (DL-DPCCH) and transmitted.

Referring to FIG. 8C, FIG. 8C illustrates a case in which an SF of a downlink dedicated physical control channel (DL-DPCCH) is 512 and an SCDI code is transmitted once for four slots.

If SF is 512, 2 bits are inserted into the TFCI field per 1 slot of the DL-DPCCH and 2 bits are inserted into the data field so that the 16-bit SCDI code is transmitted once for 4 slots. Is sent.

9A to 9E are diagrams illustrating a mapping structure of an SCD code according to the present invention.

Referring to FIG. 9A, FIG. 9A illustrates a case in which a UE transmits an SCD code only during an initial 2048 chip.

Here, the mapping structure of the SCD code depends on the spread rate SF of the uplink dedicated physical data channel (UL-DPDCH).

Therefore, assuming that the SF of the UL dedicated physical control channel (UL-DPCCH) is fixed to 256, if the SF of the UL dedicated data channel (UL-DPDCH) is 256, one during the initial 2048 chip of two slots. The SCD code of is sent. At this time, since one SCD code is 16 bits, an 8-bit SCD code is inserted and transmitted in the first slot and the remaining 8-bit SCD code is inserted and transmitted in the second slot.

According to this method, if SF is 128, one SCD code is inserted and transmitted during the initial 2048 chip of one slot. If SF is 64, the same SCD code is repeatedly inserted two times during the initial 2048 chip of one slot. If the SF is 32, the same SCD code is repeatedly inserted four times during the initial 2048 chip of one slot. If the SF is 16, the same SCD code is transmitted eight times during the initial 2048 chip of one slot. Transmitted after inserting repeatedly, if SF is 8, the same SCD code is inserted repeatedly for 16 times during the initial 2048 chip of 1 slot, and if SF is 4, the same SCD is transmitted during initial 2048 chip of 1 slot. The code is inserted 32 times and then sent.

The slot structure shown in FIG. 9A is repeated for 8 slots or 10 slots as described with reference to FIGS. 5 to 7.

When mapping SCD codes according to this method, the remaining bits per slot according to SF are 2 bits when SF is 256, 4 bits when SF is 128, 8 bits when SF is 64, and 16 bits when SF is 32. If SF is 16, 32 bits, SF is 8, 64 bits and SF is 4, 128 bits.

In the present invention, when the SCD code is mapped in this way, the remaining bits per slot are processed in three ways.

In the first method, as shown in FIG. 9A, bits remaining in one slot are padded with dummy data and transmitted according to SF.

The second method is a method of gating remaining bits per slot as shown in FIG. 9B.

This means that no data is inserted and transmitted during the 512 chip.

The third method is a method of repeatedly inserting the SCD code or inserting the SCD code after dividing the slot for several slots as shown in FIGS. 9C to 9E.

In more detail, when SF is 256, the SCD code is divided into 8 slots and transmitted. This means that 16 bits of SCD codes are separately inserted into 8 slots and transmitted to the base station BS in consideration of the remaining portion of 2 bits per slot.

According to this method, when SF is 128, the remaining portion per slot is 4 bits, so the SCD code is inserted into 4 slots and transmitted.In case of SF is 64, the remaining portion per slot is 8 bits, so there are 2 SCD codes. When the SF is 32, the SCD code is inserted as it is, and the SCD code is inserted into the remaining part. If the SF is 16, the SCD code is inserted as it is. Is repeatedly inserted 2 times in the remaining part, and when SF is 8, the remaining part per 1 slot is 64 bits, so the SCD code is inserted 4 times in the remaining part, and when SF is 4, the remaining part is 1 slot. Since is 128, the SCD code is inserted 8 times and inserted in the remaining part.

On the other hand, the UE (UE) and the base station (BS) according to the present invention can reduce the collision probability of the common packet channel (CPCH) by coding and transmitting the SCD code and SCDI code by slot unit.

10 is a diagram illustrating a mapping structure of an SCDI code and an SL code according to the present invention.

Referring to FIG. 10, in the method for allocating a common packet channel (CPCH) according to the present invention, an SL code is generated by coding an SCD code and a SCDI code for slot collision detection of a common packet channel (CPCH) in units of slots. By transmitting the SL code when transmitting the SCD code and the SCDI code, the collision probability of the common packet channel (CPCH) is lowered.

In more detail, assuming that the SF of the downlink dedicated physical control channel (DL-DPCCH) is 256 and transmits the SCD code for 8 slots at the UE, the UE encodes the SCD code in units of slots. The SL code is generated and the generated SL code is transmitted to the base station (BS) together with the SCD code. In this case, assuming that a code for coding in a slot unit is an Sl code, the Sl code is composed of a Hadamard code having a length of 4.

Then, SL codes can be generated in four ways as shown in Table 3 below.

Here, the entire symbol in one slot corresponds to the SL code.

On the other hand, the base station (BS) also generates the SL code by coding the SCDI code in units of slots as in the user side (UE).

Four SL codes are generated by the base station (BS) as shown in Table 4 below.

When the SL code is used, the collision detection and collision cancellation of the common packet channel (CPCH) performed between the UE and the BS are as follows.

First, the UE selects one of the 16 SCD codes, selects one of the four SL codes, and transmits the selected SCD code and the SL code to the base station BS for 8 slots every 2 slots.

Then, the base station (BS) similarly transmits the SCDI code and the SL code to the selected user side (UE) in two ways.

In the first method, as shown in FIG. 10, the BS inserts an SCDI code into a data field of a downlink dedicated physical control channel (DL-DPCCH), and inserts an SL code into a downlink dedicated physical control channel (DL-DPCCH). It inserts into TFCI field of and transmits to corresponding UE.

At this time, one SL code of length 4 is transmitted for 2 slots.

As shown in Table 4, the second method is to transmit one of four SL codes generated by coding the SCDI in units of slots for four slots. At this time, the SL code shown in Table 3 is transmitted as a Bi-Orthogonal code.

Meanwhile, the SCD code and the SCDI code described so far may adjust the initial transmit power by applying closed loop power control.

That is, when the SCD code and the SCDI code are transmitted during the transmission interval of the power control preamble as described in the first embodiment, the initial power of the uplink I channel is set as follows.

When the SCD code and the SCDI code are transmitted within the transmission interval of the power control preamble as described in the first embodiment, the initial power Pscd of the uplink I channel is set to Pcd a / (Nr X SF)-b. do. Where Pcd is the power of the CD preamble, SF is the spreading factor, Nr is the SCD code repetition number according to SF, and a and b are constants and can be adjusted according to the system.

Meanwhile, when the SCD code and the SCDI code are transmitted after the transmission period of the power control preamble as described in the second embodiment, the SCD code and the SCDI code are continuously closed along the power level set through the power control preamble. Perform loop power control.

11 is a block diagram illustrating a transmitter / receiver of a base station (BS) according to the present invention.

Referring to FIG. 11, when the SCD code and the SCDI code are configured as Hadamard codes, the transmitter / receiver of the base station BS according to the present invention is made with the rake receiver 100 and the switch unit 110. To a Mad Decoder 130, a Code Decision 140, a Hadamard Encoder 150, a Data Encoder 160, and a Data Decoder 120 It is composed.

In this case, when the collision detection process for the common packet channel (CPCH) is performed, the switch unit 110 switches to the Hadamard decoder 130 and connects the packet through the common packet channel (CPCH) from the UE. When receiving data, transfer to the data decoding unit 120 to connect.

In addition, the Hadamard decoder 130 decodes the SCD code received from the user side (UE), and the code determination unit 140 determines the SCDI code to be transmitted to the corresponding user side (UE), and the Hadamard encoder 150 The code determination unit 140 generates the SCDI code determined.

The data encoder 160 codes the SCDI code generated by the Hadamard encoder 150 and transmits the SCDI code to the corresponding UE.

As described above, according to the method for allocating the common packet channel (CPCH) according to the present invention has the following advantages.

First, since the conventional CD preamble and the CD-AICH can be used in parallel with the collision detection method of the common packet channel, it is possible to efficiently allocate the common packet channel by reducing the probability of occurrence of the collision of the common packet channel.

Second, since the collision detection process of the common packet channel is performed during the transmission interval of the power control preamble or after the transmission of the power control preamble during the initialization of the closed loop power control, an additional time delay does not occur, thereby improving system performance. There is.

Claims (41)

delete delete delete A method for a mobile station to be assigned a common packet channel (CPCH) through random access, Receiving channel allocation request acknowledgment information corresponding to a channel allocation request signal (AP) for common channel allocation; Transmitting a Collision Detection Preamble (CDP); Receiving first collision detection information corresponding to the collision detection identifier; And Transmitting a packet data or a channel allocation request signal according to whether the second collision detection information for the common packet channel is received after a predetermined time elapses from the reception time of the first collision detection information. Common packet channel allocation method comprising a. The method of claim 4, wherein And the second collision detection information is information for instructing to start packet data transmission. The method of claim 5, The second collision detection information is transmitted through a Dedicated Physical Control Channel (DPCCH). The method of claim 6, And the second collision detection information is inserted into a transmission format combination identifier (TFCI) field of the dedicated physical control channel and transmitted. The method of claim 7, wherein The second collision detection information is transmitted in the transmission interval of the power control preamble (PC Preamble) at the time of initialization of the closed loop power control. In the base station allocates a common packet channel (CPCH), Receiving a common channel allocation request signal (AP); Transmitting channel allocation request acknowledgment information corresponding to the channel allocation request signal; Receiving a Collision Detection Preamble (CDP); Transmitting first collision detection information corresponding to the collision detection identifier; And Transmitting a second collision detection information to the mobile station when a common packet channel assigned to the mobile station is not assigned to another mobile station after a predetermined time elapses from the time of receiving the first collision detection information. Common packet channel allocation method comprising a. The method of claim 9, The common channel allocation request signal (AP) includes common packet channel information to be allocated by the mobile station. The method of claim 9, The transmitting of the first collision detection information may include: transmitting the first collision detection information to the mobile station when the signal strength of the collision detection identifier transmitted from the mobile station is greater than the signal strength of the collision detection identifier transmitted from another mobile station. A common packet channel allocation method, characterized by transmitting. delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete

Images