KR20010017950A - Transmission Method for status information of Common Packet Channel - Google Patents

Abstract

PURPOSE: A method for transmitting state information of a common packet channel(CPCH) is provided to update the state information of the CPCH each a determined period through a down link dedicated physical control channel(DLDPCCH) in a base station, and to transmit latest channel information to a user, so as to exactly predict the channel information when a reassignment of a new common packet channel is requested, and to implement the state information of the CPCH without increasing system components. CONSTITUTION: State information of a common packet channel(CPCH) is displayed as a CPCH status information(CSI) bit. The CSI bit is transmitted to a user through a down link dedicated physical control channel(DLDPCCH) of a base station. The CSI bit is transmitted to the user by being inserted in a transport format combination indicator(TFCI) part of the DLDPCCH. The DLDPCCH comprises the CSI displaying the state information of the CPCH, transmission power control(TPC) data for a power control, and pilot data.

Description

Transmission Method for status information of Common Packet Channel}

The present invention relates to the next generation mobile communication, and more particularly, to a method for transmitting state information of a common packet channel suitable for transmitting state information of a common packet channel (CPCH) using a downlink dedicated physical control channel (DL DPCCH). will be.

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 common packet channel (CPCH) is associated with a dedicated channel (DCH), which is a channel for performing closed loop power control on the common packet channel (CPCH) of the uplink (UP), and the dedicated channel (DCH) Is mapped to a dedicated physical control channel (DPCCH) which is a physical channel.

The common packet channel (CPCH) uses a random access scheme to provide communication services to multiple users (UEs). Accordingly, a common packet channel (CPCH) that is usable by the network side UTRAN including the base station BS is allocated to a user UE side that transmits packet data in a random access method that is a contention.

From now on, a procedure for allocating a common packet channel (CPCH) will be described in detail according to a technique proposed by 3GPP (3GPP TSGR1 # 5 (99) 592 Golden Bridge Technology, "CPCH Physical Layer Procedures").

1 is a diagram illustrating the overall structure of a conventional common packet channel (CPCH).

Referring to FIG. 1, a common packet channel (CPCH) may be described in largely divided into four parts, and accordingly, an allocation procedure of a common packet channel may be divided into four parts.

The first is a power ramping process in which the level of signal transmission power is adjusted at the UE side so that the BS can receive the power ramping process.

The power ramping process includes an access preamble (hereinafter, abbreviated as AP) transmitted from a user side (UE) and an access preamble acquisition indication channel (Access) transmitted from a base station BS, which is a kind of response signal to the AP. Preamble Acquisition Indication Channel (hereinafter abbreviated as AP-AICH). In this case, the AP is composed of 16 symbol groups and spreading codes, and the AP-AICH is composed of 16 symbol groups, spreading codes, and channelization codes.

Referring to the operation flow of the power ramping process, first, the user side (UE) monitors the AICH transmitted from the base station (BS) to check whether there is a common common packet channel (CPCH).

Subsequently, the UE selects any one of the detected common packet channels (CPCHs), and then transmits the AP to the base station (BS) using a signature corresponding to the selected common packet channel (CPCH) one-to-one. do. At this time, the UE (UE) increases the AP power at regular intervals until receiving the AP-AICH, which is a response channel for the AP transmitted from the base station (BS).

Meanwhile, the BS receives each AP transmitted from several UEs, selects one UE to allocate a common packet channel (CPCH), and then uses the same symbol as the selected UE. -Transmit AICH.

Then, the UE receives the AP-AICH and compares the AP-AICH with the AP, and then finds that the UE is selected. At this time, the UE does not restart the power ramping process.

Secondly, the collision detection preamble (hereinafter referred to as CD-P) transmitted by the user UE is a process of detecting and processing a collision that occurs when multiple UEs simultaneously allocate a common packet channel. Abbreviated) and CD-AICH transmitted by the base station BS, which is a kind of response signal to the CD-P. In this case, the CD-P is composed of 16 symbol groups and spreading codes, and the CD-AICH is composed of 16 symbol groups, spreading codes, and channelization codes.

Here, the symbol groups of the AP, AP-AICH, CD-P, and CD-AICH are all 16, and among them, the AP and AP-AICH symbol groups correspond to 16 CPCH channelization codes one-to-one.

Accordingly, 16 common packet channels (CPCHs) are divided into several sets according to a transmission rate and managed.

Referring to the operation flow of the collision detection and processing process of the common packet channel (CPCH), one or more UE (UE) receiving the AP-AICH composed of the same symbol as the AP transmitted from the base station (BS) first Each of the 16 symbol groups selects a symbol and transmits the CD-P to the BS using the selected symbol. Then, after receiving the CD-P transmitted from one or several UEs, the BS selects any one of the transmitted CD-Ps and prevents the collision of the common packet channel (CPCH). The CD-AICH having the same symbol is transmitted.

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) is configured as a CL-PC preamble transmitted to each other in the uplink and downlink.

Here, the CL-PC preamble includes a pilot information field for estimating a channel state, a transmit power control (TPC) information field and a dummy data field for the CL-PC, as shown in FIG. Dummy data is transmitted through a dedicated physical data channel (DPDCH), and pilot data and TPC data are transmitted through a dedicated physical control channel (DPCCH) of the Q stage. In the downlink, a dedicated physical control channel (DPCCH) and a dedicated physical data channel (DPDCH) are time-divided to transmit pilot data, TPC data, and dummy data.

Referring to the operation flow of the initialization process of the closed-loop power control, first, the UE (UE) receiving the CD-AICH having the same symbol from the base station (BS) transmits the PC preamble to the base station (BS), The other UE starts again from 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, the UE transmits packet data. The UE transmits packet data, pilot, and TPC data to the BS through a common packet channel (CPCH). BS) transmits pilot and TPC data for closed loop power control to a UE through a downlink dedicated physical control channel (DPCCH).

However, in the allocation process of the conventional common packet channel (CPCH), the user side (UE) transmitting packet data through the common packet channel (CPCH) does not monitor the AICH transmitted from the base station (BS). This is because the configuration of the system is complicated and hardware overhead is increased to receive downlink dedicated physical control channel (DL DPCCH) and AICH while transmitting packet data at the UE.

Accordingly, the UE may not know the state information of the common packet channel CPCH while transmitting the packet data through the common packet channel CPCH. Accordingly, the UE may retransmit the packet data after transmission. For this reason, when a situation in which packet data needs to be transmitted again within a short time occurs, there is a problem that the channel information cannot be received quickly because the state information of the common packet channel (CPCH) cannot be accurately predicted.

Accordingly, an object of the present invention has been devised in view of the above-described problems of the prior art, and the UE continuously performs transmission of packet data through the common packet channel (CPCH) on the UE side. It is to provide a state information transmission method of a common packet channel that can know the state information.

According to an aspect of the present invention for achieving the above object, in the state information transmission method of the common packet channel, the base station is set to the user side (UE) and the dedicated channel (DCH), the base station is the user side ( Channel information required by the UE is inserted into an empty part of a DL dedicated physical control channel (DL DPCCH) and transmitted.

Preferably, the channel information is state information indicating idle or busy of a common packet channel (CPCH), and the base station is a transport format combination indicator (TFCI) of the downlink dedicated physical control channel (DL DPCCH). In the TFCI encoding method, the channel information is inserted and transmitted.

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

2 is a diagram illustrating a structure of a conventional downlink dedicated physical control channel (DL DPCCH).

3 is a diagram illustrating a structure of a downlink dedicated physical control channel (DL DPCCH) according to the present invention;

4 is a diagram illustrating a frame process of state information of a common packet channel (CPCH) according to the present invention.

5 is a view for explaining a method of transmitting status information of a common packet channel (CPCH) according to the present invention.

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, the UE may monitor the state information on the common packet channel (CPCH) of the base station (BS) while transmitting packet data to the base station (BS) through the common packet channel (CPCH). We propose a method of transmitting status information.

To this end, the present invention generates a new CPCH Status Information (CSI) bit having the status information of a common packet channel (CPCH) and transports it to a Transport Format Combination Indicator (TFCI) of a downlink dedicated physical control channel (DL DPCCH). Insert into the part and send it to the user side (UE).

At this time, the common packet channel (CPCH) is divided into a predetermined group, the CSI information indicates the state information of the divided common packet channel (CPCH).

3 is a diagram illustrating a structure of a downlink dedicated physical control channel (DL DPCCH) according to the present invention.

Referring to FIG. 3, in the present invention, the state information of the common packet channel (CPCH) is represented by CSI bits, and the state information of the common packet channel (CPCH) transmitted in one frame is defined as a CSI unit.

Such CSI bits are transmitted to the UE through a downlink dedicated physical control channel (DL DPCCH) of a base station (BS), where the CSI bits are inserted into a TFCI portion of a downlink dedicated physical control channel (DL DPCCH). Sent to the user side (UE). This is because the conventional TFCI part is composed of dummy data, and thus the present invention is replaced by the CSI bit.

Accordingly, the downlink dedicated physical control channel (DL DPCCH) according to the present invention includes CSI indicating state information of a common packet channel (CPCH), TPC data for power control, and pilot data.

4 is a diagram illustrating a frame process of a CSI according to the present invention.

Referring to FIG. 4, the present invention divides and manages a common packet channel (CPCH) that can be used by a base station (BS) into a predetermined group. In the present invention, a case in which a common packet channel (CPCH) is divided into two groups will be described as an embodiment.

Since the size of information corresponding to one group divided in the common packet channel (CPCH) can be included in one frame, one group information is transmitted in one frame of the downlink dedicated physical control channel (DL DPCCH). do.

Therefore, if the common packet channel (CPCH) is divided into two groups, CSI is transmitted using two frames.

For example, when the number of common packet channels (CPCH) is 16, the 16 common packet channels (CPCH) are divided into eight low rate channel groups and eight high rate channel groups. Divide into

Then, one CSI unit has idle / busy information for eight common packet channels (CPCH). Here, the total CSI is divided into two CSI units according to the low rate and the high rate, and each divided CSI unit is inserted into the CSI bits of the downlink-oriented physical control channel through TFCI encoding. It is transmitted to the user side (UE) for 2 frames later.

At this time, each of the two divided CSI units, that is, the low-rate CSI unit and the high-rate CSI unit has a size of 10 bits, each of the 10-bit CSI unit is generated and output to 30 bits through the TFCI encoding process.

Here, one frame of the downlink dedicated physical control channel (DL DPCCH) is configured with 15 slots, and since two bits of CSI bits may be inserted in each slot, eventually 30 bits of CSI information may be inserted in one frame. Each CSI unit divided into bits generates 30 bits through TFCI encoding.

Each CSI unit generated by 30 bits through the TFCI encoding process is mapped to two frames of a downlink dedicated physical control channel (DL DPCCH). At this time, since the TFCI portion of each slot is 2 bits, each CSI unit of 30 bits is mapped to 15 slots.

The reason why the CSI unit undergoes the TFCI encoding process is to prevent the CSI information from being lost while passing through the wireless channel. At this time, since the existing TFCI encoding scheme is used, there is no increase in additional components of the system.

5 is a diagram illustrating a CSI transmission method according to the present invention.

Referring to FIG. 5, power is related to system capacity in a next generation mobile communication system based on a code division multiple access (CDMA) scheme. In other words, as the transmission power decreases, the capacity that the system can accommodate increases.

Therefore, in the present invention, the transmission of the CSI is performed only during a specific time in consideration of the correlation between power and capacity.

For example, when there are two CSI units, the CSI continuously transmits through the CSI bit of the downlink dedicated physical control channel (DL DPCCH) only during the first two frames of the N frames during the predetermined update period of the CSI, and the remaining N − The CSI bit is not transmitted during two frames.

Then, the slot structure for the first two frames in which the CSI is transmitted in the N frame is as shown in FIG. 3, and the slot structure for the remaining N-2 frames is as in FIG.

Here, the update period of the CSI starts from the first frame of the power control preamble transmitted during the initialization of the closed loop power control during the allocation process of the common packet channel (CPCH). Therefore, the CSI transmission starts immediately upon transmission of the power control preamble, and the transmission of the CSI is terminated according to the time point at which the common packet channel (CPCH) and the downlink dedicated physical control channel (DL DPCCH) are released.

Since the CSI update is continuously performed until the end of the CSI transmission, the CSI transmitted through one downlink dedicated physical control channel (DL DPCCH) is composed of new information according to the state information of the common packet channel (CPCH) at each update period. do.

The CSI transmission method according to the present invention will now be described with reference to specific embodiments.

First embodiment

In the first embodiment, it is assumed that the number of common packet channels (CPCH) is sixteen.

First, it is assumed that the following system conditions are set.

Spread rate (SF) of the downlink dedicated physical control channel (DL DPCCH) = 512, the number of pilot bits per slot of the downlink dedicated physical control channel (DL DPCCH) = 4, of the downlink dedicated physical control channel (DL DPCCH) TPC bits per slot = 2, CSI bits per slot of downlink dedicated physical control channel (DL DPCCH) = 2, one CSI unit size = 10.

In addition, it is assumed that transmission rates of sixteen common packet channels (CPCH) are as follows.

# 1-# 10 CPCH: 64 kbps channel, # 11-# 14 CPCH: 144 Kbps channel, # 15-# 16 CPCH: 384 kbps channel.

At this time, the 16 common packet channels (CPCH) are divided into two groups according to the transmission rate, and then configures the state information of the common packet channel (CPCH) according to the two CSI units.

Accordingly, the CSI unit # 1 has state information of the common packet channel (CPCH) # 1 to # 8, and the CSI unit # 2 has state information of the common packet channel (CPCH) # 9 to # 16.

Here, it is assumed that the state of the current common packet channel (CPCH) is shown in Table 1 below.

CPCH condition One children 2 Busy 3 children 4 children 5 Busy 6 Busy 7 Busy 8 Busy 9 children 10 children 11 Busy 12 Busy 13 children 14 children 15 children 16 children

Then, the CSI unit is configured as shown in Table 2 below.

Here, the first two bits of the 10 bits of each CSI unit are numbers for distinguishing units, and the remaining eight bits indicate status information of a common packet channel (CPCH).

Therefore, the CSI unit # 1 shows the state of eight common packet channels (CPCHs) of # 1 to # 8, that is, the idle / busy state, and the CSI unit # 2 shows the idle / busy of eight channels of # 9 to # 16. Indicates the state.

Here, the meaning of each CSI unit value shown in Table 2 is shown in Table 3 below.

CSI Unit Information 00 CSI unit # 1 information 11 About CSI Unit # 2

Common Packet Channel (CPCH) Status Information 0 Kids channel One Busy channel

Referring to Table 3, '00' represents CSI unit # 1 and '11' represents CSI unit # 2. '0' and '1' indicate state information of a common packet channel (CPCH), respectively.

Then, each 10-bit CSI unit shown in Table 2 is generated as 30 bits through the TFCI encoding process, and each 30-bit CSI unit is inserted into the initial 2 frames of the downlink dedicated physical control channel (DL DPCCH), respectively, to the user side. Transmitted as (UE).

Here, since each CSI unit generated with 30 bits is mapped to initial 2 frames with respect to N frames, which are CSI update periods, the remaining N-2 frames have the same structure as before. In this case, since one frame includes 15 slots, 30 bits of CSI bits may be transmitted in each frame.

As described above, the present invention transmits the latest channel information to the user side (UE) by updating the state information of the common packet channel (CPCH) by a predetermined period through the downlink-oriented physical channel in the base station (BS), the user side (UE) In the case of transmitting packet data through the common packet channel (CPCH), it is possible to know the status information of the common packet channel of the base station (BS) so that the channel information can be accurately predicted when a reallocation request of the new common packet channel (CPCH) is requested. It works.

In addition, since the state information of the common packet channel (CPCH) transmitted according to the present invention is inserted into an empty portion of the downlink dedicated physical control channel (DL DPCCH) and transmitted in the existing encoding scheme, it can be easily implemented without increasing the components of the system. It can be effective.

In addition, since the base station (CPCH) transmits the state information of the common packet channel (CPCH) without using the downlink dedicated physical data channel (DL DPDCH), no additional operation is required for receiving the state information at the UE (UE). There is an effect that no time delay occurs.

Claims (3)

In setting up a plurality of UEs and a dedicated channel (DCH) by a base station, And transmitting, by the base station, channel information required by the user side (UE) by inserting it into an empty portion of a downlink dedicated physical control channel (DL DPCCH). The method of claim 1, wherein the channel information is status information indicating idle or busy of a common packet channel (CPCH). The common packet channel of claim 1, wherein the base station inserts and transmits the channel information in a TFCI encoding scheme in a transport format combination indicator (TFCI) portion of the downlink dedicated physical control channel (DL DPCCH). How to send status information.