CN100426697C - Downlink power control method in multi-carrier cell - Google Patents

Abstract

The invention discloses a downlink power control method in a multi-carrier frequency cell, comprising: the transmitted downlink request message includes a carrier frequency information item and a downlink time slot interference signal code power information item, When adjusting the downlink transmission power of the slot, first judge whether the current cell is a multi-carrier frequency cell or a single-carrier frequency cell. Adjust the downlink transmission power of the corresponding time slot according to the ISCP value of the downlink time slot; if it is a multi-carrier frequency cell, write the channel center frequency in the carrier frequency information item in the request message to be sent, and the receiving end The ISCP value of the slot and the center frequency of the carrier frequency are used to adjust the downlink transmit power of the time slot corresponding to the carrier frequency. The invention ensures the one-to-one correspondence between the ISCP value of the downlink time slot, the time slot and the corresponding carrier frequency in the multi-carrier frequency cell, and realizes the power control requirement of each time slot in the downlink.

Description

Downlink power control method in multi-carrier frequency cell

technical field

The present invention relates to a downlink power control method in a multi-carrier frequency cell, in particular to a downlink in a multi-carrier frequency cell of a time division synchronous code division multiple access system (Time Division-Synchronous Code Division Multiple Access, TD-SCDMA) way of power control.

Background technique

With its convenience and flexibility, cellular mobile communication meets the communication needs of people in modern society for work and life, showing a momentum of rapid development. With the development and popularization of the Internet, mobile data services are generally favored. The spectrum efficiency and spectrum resources of the existing second-generation mobile communications cannot meet the needs, and spectrum resource shortages have occurred in many countries. In view of this, the International Telecommunication Union (ITU) has proposed the third generation mobile communication. The third generation mobile communication system includes an Iub interface between a radio network controller and a Node B (Node B) and an Iur interface between the radio network controllers.

As shown in Figure 1, when the downlink transmit power of each time slot needs to be controlled, the control radio network controller (CRNC, Control Radio network controller) sends a "downlink link" to Node B (Node B) through the Iub interface Power time slot control request (DL POWER TIMESLOT CONTROL REQUEST)" message. As shown in Figure 2, the serving radio network controller (SRNC, Server Radio network controller) sends the "downlink power slot control request" message to the Drift Radio Network Subsystem (DRNS, Drift Radio network Subsystem) through the Iur interface. DRNS consists of Drift Radio Network Controller (DRNC, Drift Radio network controller) and multiple Node Bs. The message sent from SRNC to DRNS is essentially sent from SRNC to DRNC, and then sent to Node B by DRNC. The purpose of sending the "downlink power slot control request" message is to provide Node B/DRNS with an updated downlink slot ISCP (Interference Signal Code Power, interference signal code power) value, and Node B/DRNS uses the information included in the request message The downlink transmit power of each time slot is determined by the downlink time slot ISCP (DL Timeslot ISCP) value in the "downlink time slot ISCP information (DL Timeslot ISCP Info Low Code Rate TDD)". That is to say, when the ISCP value of the downlink time slot is small, the downlink transmission power is reduced, and when the ISCP value of the downlink time slot is large, the downlink transmission power is increased, so as to keep the entire downlink power of the radio link (Radio Link, RL) unchanged.

In processes such as "radio link establishment", "radio link addition" or "synchronous radio link reconfiguration", it is also necessary to determine the downlink initial transmission power of the time slot. At this point, CRNC/SRNC send the "Radio Link Setup Request (RL Setup Request)" message, "Radio Link Addition Request (RL Addition Request)" message or "Radio Link Reconfiguration Preparation (RL Setup Request)" message to Node B/DRNS respectively. ReconfigurationPreparation)" and other messages, Node B/DRNS uses the downlink timeslot ISCP (DL Timeslot ISCP Info LCR) value included in the above request message to determine the value of each timeslot ISCP Downlink initial transmit power. The downlink transmit power control signaling interaction processes of the Iub and Iur interfaces are shown in Figures 3, 5, and 7 and Figures 4, 6, and 8, respectively.

The format of the aforementioned downlink power control request message will be described below. The request message format is as follows:

Table 1

Information unit exist scope Notes Message Type (message type) m Transaction ID (transaction ID) m DL Time Slot ISCP Info o For 3.84Mcps TDD DL Time Slot ISCP Info LCR o For TD-SCDMA Primary CCPCH RSCP o Primary CCPCH RSCP Delta o

Among them, the letter M indicates the item that must be included, and the letter O indicates the optional item, Primary CCPCH RSCP Primary Common Control Physical Channel Received Signal Code Power (Primary Common Control Physical Channel Received Signal Code Power). It can be seen from the table that this type of request message includes DL Timeslot ISCP InfoLCR items. According to the current 3GPP protocol, one RL is composed of one or more time slots. "Downlink time slot ISCP information" includes each downlink time slot of one RI and the corresponding "downlink time slot ISCP" value. Its specific format is as follows:

Table 2

Information unit exist scope DL Time Slot ISCP Info LCR 1..<maxnoofULtsLCR> >Time Slot LCR m >DL Timeslot ISCP m

Among them, the item maxnoofDLtsLCR represents the maximum number of downlink time slots included in each RL in the TD-SCDMA system.

In order to increase cellular capacity and meet the needs of market cellular capacity, a multi-carrier frequency cell system is used to increase user capacity, that is to say, a cell has multiple carrier frequencies, of which there is only one main DwPTS and broadcast messages), others are called secondary carrier frequencies. In the TD-SCDMA industry standard released in 2004, the concept of multi-carrier was introduced. Therefore, in a multi-carrier frequency cell system, a cell contains multiple carrier frequencies. According to the requirements of this industry standard, the TD-SCDMA system The cell is not a single carrier frequency cell but a multi-carrier frequency cell. A cell can have a main carrier frequency and multiple auxiliary carrier frequencies. Each carrier frequency (main carrier frequency and auxiliary carrier frequency) in a cell has exactly the same frame structure and slot structure. The network side can allocate each UE to the main carrier frequency or the auxiliary carrier frequency according to its own resource allocation principle. Therefore, in a multi-carrier frequency cell, for a time slot, it is meaningful to specify which carrier frequency it belongs to.

The current industry standard does not take into account that the ISCP value of the downlink time slot must also indicate which carrier frequency and which time slot correspond to it to be meaningful. This is because each UE allocated dedicated resources (for example, established a radio link) resides on different carrier frequencies. Therefore, each UE measures and reports the ISCP value of the downlink time slot to the Node B. Even if it corresponds to the same time slot, the reporting results are different because each UE resides on a different secondary carrier frequency.

In the TD-SCDMA single-carrier cell, the carrier frequency of the cell is specified in the relevant parameters of the cell, and the ISCP value of the downlink time slot at this time only needs to correspond to the time slot. However, in a TD-SCDMA multi-carrier cell, the cell has a main carrier frequency and multiple auxiliary carrier frequencies. At this time, the ISCP value of the downlink time slot not only needs to correspond to the time slot, but also needs to correspond to a certain carrier frequency. There is no technical solution to this problem at present.

Contents of the invention

In view of the problems and deficiencies in the downlink power control method in the multi-carrier frequency sub-district of the above-mentioned existing TD-SCDMA system, the purpose of the present invention is to provide a time slot that can guarantee the ISCP value of the downlink time slot in the multi-carrier sub-district and its corresponding time slot A downlink power control method in a multi-carrier frequency cell corresponding to one carrier frequency.

The present invention is achieved in this way: a downlink power control method in a multi-carrier frequency cell comprises the following steps:

(1) The downlink request message sent by the radio network controller includes a carrier frequency information item and a downlink time slot interference signal code power information item, wherein the carrier frequency information item includes information indicating a channel center frequency, and the The downlink time slot interference signal code power information item includes the downlink time slot and the interference signal code power value of the downlink time slot;

(2) When it is necessary to adjust the downlink transmission power of each time slot of the wireless link, first judge whether the current cell is a multi-carrier frequency cell or a single-carrier frequency cell, if it is a single-carrier frequency cell, then the wireless The network controller blanks the carrier frequency information item in the request message to be sent, and the receiving end adjusts the downlink transmission power of the corresponding time slot according to the interference signal code power value of the downlink time slot carried in the received downlink request message; If it is a multi-carrier frequency cell, the radio network controller writes the center frequency of the corresponding channel in the carrier frequency information item in the request message to be sent, and the receiving end receives the downlink time slot according to the received downlink request message. The code power value of the interference signal and the center frequency of the carrier frequency are used to adjust the downlink transmit power of the time slot corresponding to the carrier frequency.

Preferably, the need to adjust the downlink transmission power of each time slot of the wireless link specifically refers to the need to Determine the initial transmission power of the downlink; the downlink transmission power of each time slot needs to be determined in the downlink power time slot control process after the wireless link is established.

Preferably, the carrier frequency information item and the downlink timeslot interference signal code power information item may be parallel information items in the radio link information.

Preferably, the carrier frequency information item is included in the downlink timeslot interference signal code power information item.

Preferably, the radio network controller is a controlling radio network controller or a serving radio network controller, and correspondingly, the receiving end is a node B or a drift radio network subsystem respectively. The drift wireless network subsystem includes a drift wireless network controller and one or more node Bs connected thereto.

The present invention aims at the characteristics that the TD-SCDMA system can simultaneously support single-carrier frequency cells and multi-carrier frequency cells, and adds carrier frequency information in the request message of downlink power control, so that during the process of downlink power control, the Guarantee the one-to-one correspondence between DL Timeslot ISCP, time slot and corresponding carrier frequency in multi-carrier frequency cells, so as to realize the power control requirements of each time slot in the downlink of Node B/DRNS.

Description of drawings

Fig. 1 is the signaling interaction schematic diagram of Iub interface downlink power time slot control process;

Fig. 2 is a schematic diagram of signaling interaction of the Iur interface downlink power slot control process;

Fig. 3 is the signaling interaction schematic diagram of Iub interface wireless link establishment process;

Fig. 4 is a schematic diagram of signaling interaction of the Iur interface wireless link establishment process;

Fig. 5 is the signaling interaction schematic diagram of Iub interface wireless link increase process;

Fig. 6 is a schematic diagram of signaling interaction of the Iur interface wireless link adding process;

Fig. 7 is a schematic diagram of signaling interaction for Iub interface synchronous wireless link reconfiguration preparation;

FIG. 8 is a schematic diagram of signaling interaction for Iur interface synchronous radio link reconfiguration preparation;

Fig. 9 is a process flowchart of the present invention.

Detailed ways

Taking the TD-SCDMA system as an example, the present invention will be described in detail.

The carrier frequency information item corresponding to the time slot is added to the downlink power time slot control request message of the Iub and Iur interfaces, which is denoted as URAFCN. That is, add carrier frequency information items on the basis of Table 1, as shown in the following table:

table 3

Information unit exist scope Notes Message Type M (must, required) Transaction ID m DL Time Slot ISCP Info LCR O (optional, optional) For TD-SCDMA Primary CCPCH RSCP o Primary CCPCH RSCP Delta o URAFCN o Only for multi-carrier frequency

The part in bold in the last line is the added carrier frequency information item, which records the carrier frequency information corresponding to the time slot, that is, records the center frequency that characterizes the channel characteristics.

Of course, the carrier frequency information item of the time slot can also be added to the DL Time Slot ISCP Info LCR item, as shown in the following table:

Table 4

Information unit exist scope DL Time Slot ISCP Info LCR 1..<maxnoofDLtsLCR> >Time slot (Time Slot LCR) m >Downlink Timeslot ISCP (DL TimeslotISCP m >URAFCN o (only for multi-carrier)

The newly added URAFCN items in Table 3 and Table 4 are optional.

As shown in Figure 9, when the downlink transmission power of each time slot needs to be adjusted, the CRNC or SRNC first judges whether the current cell is a multi-carrier cell or a single-carrier cell, and when the current cell is a single-carrier cell, Then blank the carrier frequency information item in the request message to be sent; if the current cell is a multi-carrier frequency cell, write the center frequency of the corresponding channel in the carrier frequency information item in the request message to be sent.

After Node B or DRNS receives the downlink power slot control request message, it processes it accordingly. The processing process will be described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1 and 2, after the wireless link is established, CRNC/SRNC can send a "DL POWER TIMESLOT CONTROL REQUEST" message to Node B/DRNS at any time; Node B/DRNS receives the request message, if URAFCN is not empty, Then use the newly added "UARFCN" and "DL Timeslot ISCPInfo LCR" existing time slot information and the time slot ISCP value to ensure that each downlink time slot ISCP value corresponds to 1 carrier frequency information (UARFCN) and 1 time slots, indicating that the ISCP value of each downlink time slot is for a certain carrier frequency and time slot; in this way, other parameters (initial downlink transmission power, maximum downlink power, minimum downlink power, etc.) can be combined ) to determine the downlink transmission power of each time slot, that is, when some time slots on the wireless link have high interference (downlink time slot ISCP value is large), increase the transmission power of these time slots, when the wireless link Some time slots on the network have little interference, and the transmission power of these time slots is reduced, so as to keep the entire downlink transmission power of the wireless link unchanged. If it is empty, the downlink transmit power of the time slot is directly determined according to the downlink time slot ISCP value of the corresponding one time slot in combination with other parameters.

As shown in Figures 3, 4, 5, 6, 7, and 8, during the process of establishing a radio link, adding a radio link, and preparing for synchronous radio link reconfiguration: CRNC/SRNC sends "RADIO LINK" to Node B/DRNS SETUPREQUEST", "RADIO LINK ADDITION REQUEST", or "RADIO LINKRECONFIGURATION PREPARE". If the UARFCN contained in these messages is not empty, the ISCP value of each downlink time slot is guaranteed through the newly added "UARFCN" and the existing time slot information in "DL Timeslot ISCP Info LCR" and the ISCP value of the time slot Both correspond to 1 carrier frequency information (UARFCN) and 1 time slot, indicating that the ISCP value of each downlink time slot is for a certain carrier frequency and time slot; thus combining other parameters (initial downlink transmit power, maximum downlink link power, minimum downlink power, etc.) to determine the downlink initial transmit power for each time slot. If it is empty, the downlink initial transmit power of the time slot is directly determined according to the ISCP value of the downlink time slot.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes and All deformations should belong to the protection scope of the appended claims of the present invention.

Claims (4)

1, downlink power control method in a kind of multi-carrier frequency cell is characterized in that, this method may further comprise the steps:

(1) radio network controller is set up request message to Node B or drifting radio network subsystem transmission down wireless link, wireless link increasing request message or synchronised radio link reconfigure preparation request message, include the carrier frequency information item in the downlink time slots Interference Signal Code Power item of information of these message, radio network controller sends downlink power time slot control request message to Node B or drifting radio network subsystem, include carrier frequency information item and downlink time slots Interference Signal Code Power item of information in the described downlink power time slot control request message, wherein said carrier frequency information item comprises the information of indication carrier frequency centre frequency, and described downlink time slots Interference Signal Code Power item of information includes the Interference Signal Code Power value of descending time slot and this descending time slot; And

(2) in the time need adjusting to the down link transmitted power of each time slot of Radio Link, judge that at first current area is multi-carrier frequency cell or single carrier cell, if the then described radio network controller of single carrier cell is put sky with the downlink time slots Interference Signal Code Power item of information desiring to send a request message or the carrier frequency information item in the downlink power time slot control request message, thereby receiving terminal is adjusted the down link transmitted power of corresponding time slot according to the Interference Signal Code Power value of the descending time slot of being taken in the received request message, if write the centre frequency of corresponding carrier frequency in the carrier frequency information item of the then described radio network controller of multi-carrier frequency cell in downlink time slots Interference Signal Code Power item of information of desiring to send a request message or downlink power time slot control request message, thereby receiving terminal is adjusted the down link transmitted power of this carrier frequency time slot corresponding according to the centre frequency of the Interference Signal Code Power value of the descending time slot of being taken in the received request message and carrier frequency.

2, downlink power control method in the multi-carrier frequency cell according to claim 1, it is characterized in that, described need the adjustment specifically the down link transmitted power of each time slot of Radio Link be meant, sets up process at Radio Link, Radio Link increases needs to determine the down link initial transmission power in process or the synchronised radio link reconfigure set-up procedure; Need to determine the down link transmitted power of each time slot in the downlink power time slot control procedure after Radio Link is set up.

3, downlink power control method in the multi-carrier frequency cell according to claim 1 and 2, it is characterized in that, described radio network controller is control radio network controller or service wireless network controller, accordingly, described receiving terminal is respectively described Node B or described drifting radio network subsystem.

4, downlink power control method in the multi-carrier frequency cell according to claim 3 is characterized in that, described drifting radio network subsystem includes floating radio network controller and connected one or more Node B.

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