HK1078387A

HK1078387A - Dsch power control method for wcdma

Info

Publication number: HK1078387A
Application number: HK05110276.9A
Authority: HK
Inventors: 金奉会; 黄承熏
Original assignee: Lg电子株式会社
Priority date: 2002-02-09
Filing date: 2003-02-03
Publication date: 2006-03-10

Description

Downlink shared channel power control for WCDMA

Technical Field

The present invention relates to wireless communications, and more particularly, to a method of controlling transmission power of a Downlink Shared Channel (DSCH) in a third generation mobile communication system.

Background

The Universal Mobile Telecommunications System (UMTS) is a third generation mobile communications system evolved from the so-called global system for mobile communications (GSM) standard. This standard is a european standard that is dedicated to providing improved mobile communication services based on a GSM core network and wideband code division multiple access (W-CDMA) technology. In 12 months 1998, ETSI in europe, ARIB/TTC in japan, T1 in the us and TTA in korea constitute the third generation partnership project (3GPP) for the creation of specifications for standardized UMTS.

Work performed by 3GPP towards standardizing UMTS has resulted in the composition of five Technical Specification Groups (TSGs), each directed towards forming network elements with independent operation. More specifically, each TSG develops, approves, and manages specifications of a related art. Among them, a Radio Access Network (RAN) group (TSG-RAN) develops specifications for functions, desired items, and interfaces of a UMTS Terrestrial Radio Access Network (UTRAN), which is a new RAN supporting W-CDMA access in UMTS.

The TSG-RAN group includes one ensemble group and four working groups. Working group 1(WG1) develops a specification for the physical layer (first layer). Working group 2(WG2) specifies the functions of a data link layer (second layer) and a network layer (third layer). Working group 3(WG3) defines specifications for the interface between base stations, Radio Network Controllers (RNCs) and the core network in UTRAN. Finally, working group 4(WG4) discusses the requirements needed to evaluate the radio link performance and the items needed for radio resource management.

Fig. 1 shows the structure of a 3GPP UTRAN. The UTRAN 110 includes one or more Radio Network Subsystems (RNSs) 120 and 130. Each RNS 120 and 130 includes an RNC 121 and 131 and one or more node bs 122, 123, 132, and 133 (e.g., base stations) managed by the RNC. The RNCs 121 and 131 are connected to a Mobile Switching Center (MSC)141 that performs circuit-switched communications with the GSM network. The RNC is also connected to a serving general packet radio service support node (SGSN)142 that performs packet-switched communications with a General Packet Radio Service (GPRS) network.

The node B is managed by the RNC, receives information transmitted by a physical layer of the terminal 150 (e.g., a mobile station, user equipment, and/or subscriber unit) through an uplink, and transmits data to the terminal 150 through a downlink. Thus, node B operates as a UTRAN access point for terminal 150.

The functions performed by the RNC include allocating and managing radio resources. The RNC directly managing the node B is called a controlling RNC (crnc). The CRNC manages common radio resources. On the other hand, the serving rnc (srnc) manages dedicated radio resources allocated to the corresponding terminal. The CRNC may be the same as the SRNC. However, when the terminal deviates from the region of the SRNC and moves to the region of another RNC, the CRNC may be different from the SRNC. Since the physical location of the various elements in a UMTS network may vary, interfaces connecting the elements are necessary. The node B and the RNC are connected to each other via an lub interface. The two RNCs are connected to each other via an lur interface. The interface between the RNC and the core network is called lu.

Fig. 2 shows a structure of a radio access interface protocol between a terminal and a UTRAN operating based on the 3GPP RAN specifications. The radio access interface protocol is horizontally composed of a Physical (PHY) layer, a data link layer, and a network layer, and is vertically divided into a control plane for transmitting control information and a user plane for transmitting data information. The user plane is an area to which traffic information of a user such as voice or IP packets is transmitted. The control plane is an area to which control information such as maintenance and management of a network interface or a call is transmitted.

In fig. 2, the protocol layers may be divided into a first layer (L1), a second layer (L2), and a third layer (L3) based on three lower layers of an Open System Interconnection (OSI) standard model, which is well known in the communication system.

The first layer (L1) operates as the Physical (PHY) layer of the radio interface and is connected to a higher Medium Access Control (MAC) layer through one or more transport channels. The physical layer transmits data transferred to the physical layer (PHY) through a transport channel to a receiver using various coding and modulation methods suitable for a radio environment. The transport channel between the PHY layer and the MAC layer is divided into a dedicated transport channel and a common transport channel based on whether it is exclusively used by a single terminal or shared by several terminals.

The second layer L2 operates as a data link layer and allows various terminals to share radio resources of the W-CDMA network. The second layer L2 is divided into a MAC layer, a Radio Link Control (RLC) layer, a Packet Data Convergence Protocol (PDCP) layer, and a broadcast/multicast control (BMC) layer.

The MAC layer transfers data through a proper mapping relationship between logical channels and transport channels. The logical channel connects a higher layer to the MAC layer. Various logical channels are provided according to the kind of transmitted information. In general, when information of the control plane is transmitted, a control channel is used. When transmitting information of the user plane, a traffic channel is used. The MAC layer is divided into two sub-layers according to the functions performed. The two sublayers are the MAC-d sublayer for managing dedicated transport channels in the SRNC and the MAC-c/sh sublayer for managing common transport channels in the CRNC.

The RLC layer forms an appropriate RLC Protocol Data Unit (PDU) suitable for transmission by a segmentation and concatenation function of an RLC Service Data Unit (SDU) received from a higher layer. The RLC layer also performs an automatic repeat request (ARQ) function by which RLC PDUs lost during transmission can be retransmitted. The RLC layer operates in three modes, a Transparent Mode (TM), an Unacknowledged Mode (UM), and an Acknowledged Mode (AM). The mode is selected according to a method used to process RLC SDUs received from a higher layer. The RLC buffer stores RLC SDUs or RLC PDUs received from a higher layer existing in the RLC layer.

The Packet Data Convergence Protocol (PDCP) layer is a higher layer of the RLC layer, allowing data items to be transmitted through a network protocol such as IPv4 or IPv 6. IP packets can be efficiently transmitted using a header compression technique that compresses and transmits header information within the packets.

The broadcast/multicast control (BMC) layer allows messages to be sent from the Cell Broadcast Center (CBC) over the radio interface. The main function of the BMC layer is to schedule and send a cell broadcast message to a terminal. Generally, data is transmitted through the RLC layer operating in unacknowledged mode.

The PDCP layer and the BMC layer are connected to the SGSN because a packet switching method is used and are located only in the user plane because they transmit only user data. Unlike the PDCP layer and the BMC layer, the RLC layer can be included in a user plane and a control plane according to a layer connected to a higher layer. When the RLC layer belongs to the control plane, data is received from a Radio Resource Control (RRC) layer. In another case, the RLC layer belongs to the user plane. In general, a transmission service of user data provided by the second layer (L2) from the user plane to a higher layer is called a Radio Bearer (RB). The service of sending control information provided by the second layer from the control plane to the higher layers is called a Signalling Radio Bearer (SRB). As shown in fig. 2, a plurality of entities may exist in the RLC and PDCP layers. This is because one terminal has a plurality of RBs, and one or two RLC entities and only one PDCP entity are generally used for one RB. The entities of the RLC layer and the PDCP layer can perform independent functions in each layer.

The RRC layer located at the lowest part of the third layer is defined only in the control plane and controls logical channels, transport channels, and physical channels related to the setup, reconfiguration, and release of RBs. At this time, setting up the RB refers to a process of stipulating the characteristics of a protocol layer and a channel required to provide a special service and setting detailed parameters and operation methods. The control message received from the higher layer may be transmitted through an RRC message.

A transport channel is a service provided by layer 1 to higher layers. The transmission channel is defined by how and with what characteristics the data is transmitted over the air interface. The transport channels may be classified into dedicated channels and common channels. There is only one type of dedicated transport channel, the Dedicated Channel (DCH). On the other hand, there are six types of common transport channels, i.e., a Broadcast Channel (BCH), a Forward Access Channel (FACH), a Paging Channel (PCH), a Random Access Channel (RACH), a Common Packet Channel (CPCH), and a Downlink Shared Channel (DSCH).

Among them, the DSCH is a downlink transport channel shared by several UEs. The DSCH is associated with one or several downlink DCHs and is transmitted over the entire cell or over only a part of the cell using beam forming antennas.

Fig. 3 shows a frame structure of a Downlink Shared Channel (DSCH). As shown in fig. 3, each frame is 10ms in length and is divided into 15 slots. Each time slot having a length of T_slot2560 chips (chip).

The DSCH is shared by several UEs through time division scheduling, which is performed at a single frame level (10ms) or over several frames. Thus, the DSCH enables a plurality of UEs having relatively low activity and burst traffic (burst traffic) to share a high data rate channel employing a common channelization code resource.

The main way to share channelization code resources is to allocate code resources to a single UE at a time in the time domain. Nevertheless, a limited degree of code multiplexing, i.e. a limited degree of simultaneous use of different parts of the code group allocated for DSCH by more than one user for transmitting DSCH data, is beneficial to increase the granularity of supported payload sizes. In other words, the DSCH is a code-multiplexed and time-multiplexed channel. Therefore, power control for the DSCH is performed in association with the UE occupying the DSCH.

The UE is identified by a root channelization code assigned to the spreading factor of the DSCH. For example, when the Spreading Factor (SF) of the DSCH is 4, 8, 16, 32, and 64, there are 4, 8, 16, 32, and 64 root channelization codes, respectively. The high-rate channelization codes are generated by dividing the low-rate channelization codes.

The DSCH is associated with one or several downlink DCHs. I.e. the UE has one DCH occupying the DSCH. In consideration of power control, the UE measures a power level of a DCH transmitted from the base station, generates a Transmit Power Control (TPC) command based on the measured power level, and transmits the TPC to the base station. The base station adjusts the power level of the DCH according to the TPC received from the UE. The base station can also update the power level of the DSCH in association with the DCH without requiring additional TPC for the DSCH. The reason why the power level of the DSCH is associated with the power level of the DCH is because the DSCH is shared by several UEs and may be occupied by only one UE. Each UE occupying the DSCH is allocated to the DCH to periodically transmit a pilot for fast power control and control information on the DSCH, referred to as an associated DCH.

Since the DSCH is associated with the DCH, data transmission from the base station to the UE through the DSCH can be performed. Each UE to which data may be transmitted on the DSCH has an associated downlink Dedicated Physical Channel (DPCH). The associated downlink DPCH is used to carry control commands for the associated uplink DPCH and, if necessary, other services such as circuit switched voice.

Fig. 4 shows a frame structure of a downlink DPCH. As described above, the DCH is a transport channel between the PHY layer and the MAC layer, and the DPCH is a physical channel between the transmitter and the receiver.

As shown in fig. 4, each frame has a length of 10ms and is divided into 15 slots (slot #0 to slot # 14). Each time slot having a length of T_slot＝2560 chips, corresponding to one power control period. Within one downlink DPCH, dedicated data generated at layer 2 and above, i.e. dedicated transport channels (DCH), is transmitted in time multiplex with control information generated in layer 1, i.e. pilot bits, TPC commands and optionally TFCI. Thus, the downlink DPCH can be seen as a time division multiplexing of a downlink Dedicated Physical Data Channel (DPDCH) and a downlink Dedicated Physical Control Channel (DPCCH). In fig. 5, the parameter k determines the total number of bits per downlink DPCH slot. It is related to the Spreading Factor (SF) of the physical channel, e.g. SF-512/2^k. Thus, SF ranges from 512 to 4. Downlink DPCH domain (N)_data1，N_TPC，N_TFCI，N_data2，N_pilot) The number of bits varies according to the slot format used. The Transport Format Combination Indicator (TFCI) field includes channel quality information such as the data rate and coding mode of the associated channel.

In case that data of one UE is transmitted on the DSCH, channel information of the DSCH as well as channel information of the DCH should be transmitted through the TFCI field of the DPCCH. For this reason, the TFCI field of each slot may be divided into two parts, one part for DCH and the other part for DSCH.

There are two methods to encode the information on the DCH and DSCH. The first method is to encode TFCI information on DCH and DSCH into one codeword using second order Reed-Muller coding, which is called Logical Split Mode (Logical Split Mode).

The second method is to encode TRCI information of DCH and TFCI information of DSCH into corresponding two codewords using first order Reed-Muller coding and scramble bits of the codewords, which is called Hard Split Mode (Hard Split Mode).

The second TFCI encoding method can be used in case that DCHs are transmitted from different RNCs. That is, the second TFCI encoding method supports TFCI information of DSCH transmitted from some RNCs.

The TPC for the DPCCH is a transmit power control command for controlling the transmit power of the uplink channel, causing the UE to adjust the transmit power in accordance with the TPC. The associated channel conditions are measured using the pilot field.

The DCH may be in soft handover while the DSCH is not, which causes problems because the DSCH is shared in one cell by several UEs in the time domain. I.e. only one cell can communicate with one UE via the DSCH, if the UE moves to a new cell it should occupy the DSCH of the associated cell. Therefore, another power control method is needed in case the DCH is in a soft handover state, i.e. the DCH is connected to more than one cell and the DSCH is connected to one base station.

Unlike the DCH for which the UE generates the TPC for the uplink DPCCH based on the sum of the powers transmitted from the multiple cells, the DSCH may be provided by only one cell, and thus it is difficult to expect reliable power control of the DSCH based on the TPC associated with the DCH.

The 3GPP standard specifies Site Selection Differential Transmission (SSDT) signaling as another macro-diversity method in soft handover mode. This method is optional in URTAN.

SSDTs operate in such a way: the UE selects one of the cells from its active set as "primary" and all other cells are classified as "non-primary". To select a primary cell, each cell is assigned a temporary Identification (ID), and the UE periodically informs the connected cells of the primary cell ID. The non-primary cell selected by the UE switches off the transmission power. The primary cell ID is communicated by the UE to the active set through the uplink FBI field. SSDT activation, SSDT termination and ID assignment are all performed by higher layer signaling.

In SSDT, the condition to become a non-primary cell is severe in order to avoid channel disconnection due to failure of primary cell selection when the channel quality is poor.

The UE periodically transmits the primary cell ID code over the portion of the uplink FBI field allocated for SSDT. The cell recognizes its status as non-primary if the following conditions are simultaneously met:

(1) the received ID code does not match its own ID code.

(2) The quality of the received uplink signal meets a quality threshold Qth, which is a parameter defined by the network.

(3) If the uplink compressed mode is used and the loss from the ID code is less than N_IDA/3 bits (as a result of the uplink compressed mode), where N_IDIs the number of bits in the ID code (after puncturing if puncturing is done).

Otherwise, the cell recognizes its status as primary.

In SSDT, only the primary cell transmits DPDCH. Since a cell having the same ID code as the primary cell ID code transmitted by the UE is set as the primary cell, the DPDCH is not transmitted to the UE when the channel quality is so poor that the primary cell cannot recognize its status as primary. To avoid this, the conditions for becoming a non-primary cell are very demanding.

SSDT is also used for power control of the transmitting DSCH. In this case, the cell transmitting DSCH in the active set decodes the cell ID code transmitted from the UE to determine whether it is primary or non-primary, while other cells in the active set do not activate SSDT. The cell whose status is set to primary reduces the transmit power of the DSCH by as much as the power offset of the primary cell.

In SSDT, a cell can recognize its status as primary in two cases, i.e., when the uplink channel quality is good to enable recognition of its status based on the primary cell ID code sent by the UE, and when the channel quality is poor to be independent of the primary cell ID code due to reduced decoding performance. In the latter case, the cell transmitting DSCH sets its state as primary regardless of the primary cell ID code to overcome the disadvantage of SSDT, i.e., all cells become non-primary.

However, the above DSCH power control using SSDT has a disadvantage in that the cell transmitting DSCH sets its state as primary and lowers DSCH transmit power even when channel quality is poor, resulting in a degradation of DSCH performance.

Disclosure of The Invention

The present invention has been made in an effort to solve the above problems.

An object of the present invention is to provide a DSCH power control method capable of preventing a cell transmitting DSCH from setting its state as primary regardless of a primary cell ID code transmitted by a UE when uplink channel quality is poor.

Another object of the present invention is to provide a DSCH power control method which can efficiently control DSCH transmit power by modifying the condition for setting a cell as a primary so that it becomes more severe.

To achieve the above object, the DSCH power control method according to the present invention includes the steps of: (a) receiving a signal from the UE, (b) determining whether a cell transmitting DSCH is set as primary or non-primary based on the received signal, and (c) adjusting DSCH transmit power according to the result of the determination.

In one aspect of the invention, a cell determines whether the received signal quality is greater than a quality threshold (Qth) and sets its state as non-primary when the received signal quality is not greater than the quality threshold. On the other hand, when the received signal quality is greater than the quality threshold, the cell determines whether or not the primary cell ID code contained in the received signal matches the cell ID code of the cell, sets its status as non-primary when the cell ID code does not match the primary cell ID code, and sets its status as primary when the cell ID code matches the primary cell ID code.

In another aspect of the present invention, the cell further determines whether the received signal is encoded in a normal or compressed mode when the cell ID code matches the primary cell ID code, sets the cell as primary when the received signal is encoded in the normal mode, and determines the number of bits (N) from the primary cell ID code when the received signal is encoded in the compressed mode_ID) Whether punctured bits are less than N_ID/3. When the number of bits (N) of the slave cell ID code_ID) The punctured bits are greater than or equal to N_IDAt/3, the cell sets its state as non-primary, and when the ratio of the slave cell ID codes isNumber of digits (N)_ID) Punctured bits less than N_IDThe state is set as main at/3.

In another aspect of the present invention, a cell first determines whether a primary cell ID code contained in a received signal matches a cell ID code of the cell, sets its status as non-primary when the cell ID code does not match the primary cell ID code, and sets its status as primary when the cell ID code matches the primary cell ID code. The cell also determines whether the received signal is encoded in a normal or compressed mode when the primary cell ID code matches the cell ID code, sets its status as primary when the received signal is encoded in the normal mode, and determines the number of bits (N) from the cell ID code when the received signal is encoded in the compressed mode_ID) Whether punctured bits are less than N_ID/3. Sequentially, when the number of bits (N) of the code from the cell_ID) The punctured bits are greater than or equal to N_IDIn/3, the cell sets it as non-primary, and when the number of bits (N) of the ID code from that cell_ID) Punctured bits less than N_IDIn the case of/3, it is assumed to be the main.

In still another aspect of the present invention, a cell first determines whether a received signal is encoded in a normal or compressed mode, performs a normal mode procedure when the received signal is encoded in the normal mode, and performs the compressed mode procedure according to the result of the determination. In the normal mode procedure, the cell determines whether a primary cell ID code contained in the received signal matches a cell ID code of the cell, sets the cell as primary when the cell ID code matches the primary cell ID code, and sets the cell as non-primary when the cell ID code does not match the primary cell ID code. During the compression process, the cell determines the number of bits (N) from the primary cell ID code_ID) Whether punctured bits are less than N_ID[ 3 ] when the number of bits of the ID code from the primary cell (N)_ID) The punctured bits are greater than or equal to N_IDWhen/3, the status is set as non-primary, and when the number of bits (N) of the ID code of the primary cell is greater_ID) Punctured bits less than N_IDAt time/3, it is determined whether the primary cell ID code contained in the received signal matches the cell ID code of the cell. Sequentially, when the smallThe cell sets it as primary when the cell ID code matches the primary cell ID code and non-primary when the cell ID code does not match the primary cell ID code.

In the DSCH power control method of the present invention, the cell decreases DSCH transmit power when the cell is set as primary and increases DSCH transmit power when the cell is set as non-primary.

Brief description of the drawings

Other objects and advantages of this invention will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings,

in the drawings:

FIG. 1 is a conceptual diagram illustrating the structure of a UMTS radio Access network (UTRAN) of 3 GPP;

fig. 2 is a conceptual diagram illustrating a protocol structure of a radio interface suitable for the UTRAN of fig. 1;

fig. 3 is a diagram showing a frame structure of a Downlink Shared Channel (DSCH);

fig. 4 is a diagram showing a frame structure of a downlink Dedicated Physical Channel (DPCH);

fig. 5 is a flowchart illustrating a DSCH power control method according to a first embodiment of the present invention;

fig. 6 is a flowchart illustrating a DSCH power control method according to a second embodiment of the present invention.

Best mode for carrying out the invention

The present invention will be described below with reference to the accompanying drawings.

In the present invention, the primary cell is determined using SSDT uplink signaling. To control DSCH transmit power, a primary cell is first selected from the active set of the associated UE. To select a primary cell, each cell is assigned a temporary Identification (ID), and the UE periodically informs the connected cells of the primary cell ID through the portion of the uplink FBI field assigned for SSDT. When the ID code received from the UE matches its own ID code, the cell recognizes its status as primary.

The primary cell selection is performed in consideration of the transmit power level of the UE. When the received signal quality is less than a predetermined level, an error may occur in decoding the received signal. In this case, the cell transmitting DSCH sets its state as non-primary, unlike a typical SSDT procedure in which the cell keeps its state as primary.

Fig. 5 is a flowchart illustrating a method of controlling DSCH transmit power according to a first embodiment of the present invention.

In fig. 5, upon receiving a signal from a UE in a cell transmitting DSCH at step S501, the cell determines whether the received uplink signal quality is greater than or equal to an uplink quality threshold (Qth) at step S502. If the received signal quality is greater than or equal to the uplink quality threshold, the cell determines whether its own ID code matches the primary cell ID code transmitted by the UE at step S503. If the cell ID code matches the primary cell ID code, the cell determines whether uplink compressed mode is used in step S504. If the uplink compressed mode is used, the cell determines whether there is less than [ N ] at step S505_ID/3]One bit is punctured from the ID code, where N_IDIs the number of bits in the cell ID code. If less than [ N ]_ID/3]With one bit punctured, the cell sets its state as primary at step S506 and the algorithm returns to step S501. In step S504, if it is determined that the uplink compressed mode is not used, the cell sets its status as primary, skipping step S505.

On the other hand, if the received signal quality is less than the uplink quality threshold (Qth) at step S502, if the cell ID code does not match the primary cell ID code from the UE at step S503, or is greater than or equal to [ N [ ]_ID/3]A bit is punctured from the cell ID code, the cell sets its status as non-primary in step S507, and the algorithm returns to step S501.

The received uplink signal quality can be ignored because the presence or absence of the primary cell is not important for DSCH power control. In this case, when two conditions are satisfied, i.e., when the cell ID code matches the primary cell ID code and is less than [ N ] in the uplink compressed mode_ID/3]One bit is punctured from the cell code, which cell sets its state as primary.

Fig. 6 is a flowchart illustrating a method of controlling DSCH transmit power according to a second embodiment of the present invention.

In fig. 6, once a cell transmitting DSCH receives a signal from a UE at step S601, the cell determines whether an uplink compressed mode is used at step S602. If the uplink compressed mode is not used, the cell determines whether its own cell ID code matches the primary cell ID code received from the UE at step S603. Thus, if the cell ID code matches the primary cell ID code, the cell sets its status as primary at step S604, and if the cell ID code does not match the primary cell ID code, the cell sets its status as non-primary at step S606.

On the other hand, if it is determined that the uplink compressed mode is used at step S602, the cell determines whether there is less than N at step S605_ID/3]One bit is punctured from the ID code. If it is determined that less than [ N ]_ID/3]One bit is punctured from the ID code, the cell performs step S603. If it is determined to be greater than or equal to [ N ]_ID/3]One bit is punctured from the ID code, the cell sets its status as non-primary at step S606.

Once the cell transmitting DSCH sets its state as primary according to the methods of the first and second embodiments, the cell decreases DSCH transmit power by a predetermined power offset for the primary cell. Selecting the primary cell means that the uplink channel quality is better.

On the other hand, when the cell transmitting DSCH is set as non-primary, the cell increases DSCH transmit power by adding a predetermined power offset to the TFCI field of the DCH.

As described above, in the DSCH transmit power control method of the present invention, when the received signal quality is poor, the cell transmitting DSCH sets its state as non-primary, making it possible to prevent the cell transmitting DSCH from reducing the DSCH transmit power even when the received signal quality is poor, unlike the typical SSDT.

Meanwhile, since in the DSCH power control method of the present invention, the DSCH transmit power is reduced when the cell transmitting DSCH is set as primary and increased when the cell transmitting DSCH is set as non-primary, the DSCH transmit power is effectively controlled according to the received signal quality.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A DSCH power control method in a mobile communication system, comprising:

(a) receiving a signal from a UE;

(b) determining whether a cell transmitting DSCH is set as primary or non-primary based on the received signal; and

(c) adjusting DSCH transmit power according to a result of the determining.

2. The DSCH power control method of claim 1, wherein (c) includes:

reducing DSCH transmit power when the cell is set as primary; and

increasing DSCH transmit power when the cell is set to non-primary.

3. The DSCH power control method of claim 1, wherein (b) includes:

determining whether the received signal quality is greater than a quality threshold (Qth); and

setting the cell as non-primary when the received signal quality is not greater than the quality threshold.

4. The DSCH power control method of claim 3, wherein (b) further includes:

determining whether a primary cell ID code contained within the received signal matches a cell ID code of the cell when the received signal quality is greater than the quality threshold; and

setting the cell as non-primary when the cell ID code does not match the primary cell ID code.

5. The DSCH power control method of claim 4, wherein (b) further includes setting the cell as primary when the cell-ID code matches the primary cell-ID code.

6. The DSCH power control method of claim 5, wherein (C) includes:

reducing DSCH transmit power when the cell is set as primary; and

increasing DSCH transmit power when the cell is set to non-primary.

7. The DSCH power control method of claim 4, wherein (b) further includes:

determining whether the received signal is encoded in a normal or compressed mode when the cell ID code does not match the primary cell ID code;

setting the cell as primary when the received signal is encoded in a normal mode;

determining the number of bits (N) from the primary cell ID code when the received signal is encoded in a compressed mode_ID) Whether punctured bits are less than N_ID/3；

When the number of bits (N) of the cell ID code_ID) The punctured bits are greater than or equal to N_IDWhen/3, the cell is set as non-primary; and

when the number of bits (N) of the cell ID code_ID) Punctured bits less than N_IDAt/3, the cell is set as primary.

8. The DSCH power control method of claim 7, wherein (c) includes:

reducing DSCH transmit power when the cell is set as primary; and

increasing DSCH transmit power when the cell is set to non-primary.

9. The DSCH power control method of claim 1, wherein (b) includes:

determining whether a primary cell ID code contained in the received signal matches a cell ID code of the cell; and

10. The DSCH power control method of claim 9, wherein (b) further includes setting the cell as primary when the cell ID code matches the primary cell ID code.

11. The DSCH power control method of claim 10, wherein (c) includes:

reducing DSCH transmit power when the cell is set as primary; and

increasing DSCH transmit power when the cell is set to non-primary.

12. The DSCH power control method of claim 9, wherein (b) further includes:

determining the number of bits (N) from the cell ID code when the received signal is encoded in a compressed mode_ID) Whether punctured bits are less than N_ID/3；

13. The DSCH power control method of claim 12, wherein (c) includes:

reducing DSCH transmit power when the cell is set as primary; and

increasing DSCH transmit power when the cell is set to non-primary.

14. The DSCH power control method of claim 2, wherein (c) includes:

determining whether the received signal is encoded in a normal or compressed mode;

performing a normal mode procedure when the received signal is encoded in a normal mode; and

performing a compressed mode procedure when the received signal is encoded in a compressed mode.

15. The DSCH power control method of claim 14, wherein the normal mode procedure includes:

determining whether a primary cell ID code contained within the received signal matches a cell ID code of the cell;

setting the cell as primary when the cell ID code matches the primary cell ID code; and

16. The DSCH power control method of claim 14, wherein the compression procedure includes:

determining the number of bits (N) from the primary cell ID code_ID) Whether punctured bits are less than N_ID/3；

When the number of bits (N) of the ID code from the primary cell_ID) The punctured bits are greater than or equal to N_IDWhen/3, the cell is set as non-primary; and

when the number of bits (N) of the ID code from the primary cell_ID) Punctured bits less than N_IDAt time/3, it is determined whether a primary cell ID code contained in the received signal matches a cell ID code of the cell.

17. The DSCH power control method of claim 16, wherein the compression procedure further includes:

18. The DSCH power control method of claim 15, wherein the compression procedure includes:

When the number of bits (N) of the ID code from the primary cell_ID) Punctured bit moreOr equal to N_IDWhen/3, the cell is set as non-primary; and

when the number of bits (N) of the ID code from the primary cell_ID) Punctured bits less than N_IDAt time/3, it is determined whether a primary cell ID code included in the received signal matches a cell ID code of the cell.

19. The DSCH power control method of claim 18, wherein the compression procedure further includes: