CN102781086A - Method and device for power control of physical random access channel (PRACH) - Google Patents

Abstract

The invention provides a method for power control of a physical random access channel (PRACH). The method comprises that one or more quantized values of power P<0,pre> which is expected to be initially received by a base station from the PRACH allocated to a terminal and one or more quantized values of power rising step length dP<rampup> during random access signaling retransmission are configured on the terminal; according to one or more quantized values of P<0,pre> and one or more quantized values of dP<rampup> which are configured for the terminal, the terminal obtains the P<0,pre> and the dP<rampup> which meet requirements of the terminal; and according to the obtained P<0,pre> and the obtained dP<rampup> which meet requirements of the terminal, the terminal obtains transmitting power P<PRACH> of the terminal on the PRACH. The invention also discloses a device for power control of the PRACH. By the aid of the device, power control parameters which meet time delay requirements of the terminal are configured for the terminal, requirements of different users for access delay are met are met, the access delay of users is reduced, the access network speed of users is improved, and the degree of satisfaction of users is improved.

Description

Power control method and device for random access channel

Technical Field

The present invention relates to the field of communications, and in particular, to a method and an apparatus for controlling power of a random Access Channel (PRACH).

Background

With the development of mobile internet and the popularization of smart phones, the demand of mobile data traffic is rapidly increasing, and the rapidly increasing data traffic poses a serious challenge to the transmission capability of a mobile communication network. Mobile data traffic will also double each year and ten years will double by one thousand times as predicted by authorities in the coming decade. With the increasing number of mobile internet access users, the mobile data service requirements of the users will increase, and the types of the mobile data services will be updated accordingly. Different mobile data services require different Quality of Service (QoS) guarantees provided by operators, such as different transmission rate guarantees, different transmission delay guarantees, different access delay guarantees, and the like. The different requirements of different mobile data services on the access delay guarantee are the problems that cellular mobile operators need to face first, and especially how to effectively reduce the access delay of users in the period of continuously increasing the number of the access users is very important.

The PRACH power control technology has been adopted by various major standards organizations, such as the Third generation partnership project (3 GPP), 3GPP2, and IEEE802, as a means for effectively reducing the user access delay. At present, the PRACH power control techniques proposed by each standard organization configure power control parameters from the perspective of ensuring that a user accesses a network, uniformly configure a set of same power control parameters for all base stations, and do not perform differentiated processing for different mobile data services and different users, so that power control cannot adapt to the access delay requirements of the user, the user cannot access the network quickly, the access quality of the user is seriously affected, and the user satisfaction is reduced. With the increasing number of access users and the increasing difference of the delay requirements of the mobile data services during access, a power control technology capable of adapting to the requirements of different users and different mobile data services during access delay needs to be provided.

Disclosure of Invention

In view of the above, the main objective of the present invention is to provide a method and an apparatus for controlling PRACH power, which can adapt to access delay requirements of different users and different mobile data services.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the invention provides a power control method of a PRACH, which comprises the following steps:

the terminal expects the power P initially received on the PRACH allocated for the terminal according to the base station configured to the terminal_0，preAnd a power up step size dP at retransmission of the random access signaling_rampupTo obtain P adapted to its own needs_0，preAnd dP_rampup；

The terminal adapts to the P of the self-demand according to the obtained P_0，preAnd dP_rampupObtaining the transmitting power P of the PRACH_PRACH。

In the above aspect, the method further includes: configuring P on the terminal_0，preOne or more quantized values of, and dP_rampupOne or more quantized values of (a).

In the above scheme, P is configured on the terminal_0，preOne or more quantized values of, and dP_rampupComprises:

the terminal acquires and stores configuration information of a PRACH (physical random Access channel) sent by a base station to the terminal, wherein the configuration information of the PRACH comprises P_0，preOne or more of the quantized values of (1) and (dP)_rampupOne or more quantized values of (a); or, by standard default configuration to the terminal P_0，preOne or more of the quantized values of (1) and (dP)_rampupOne or more quantized values of (a).

In the above scheme, the terminal configures the P to itself according to the configuration_0，preOne or more quantized values of, and dP_rampupTo obtain P adapted to its own needs_0，preAnd dP_rampupThe method comprises the following steps:

dividing the terminal into a plurality of terminal levels according to the self requirements of the terminal, and establishing the terminal levels and P_0，preThe corresponding relation between the quantized values is stored in the terminal; the terminal determines the terminal level according to the requirement of the terminal, and then determines the terminal level according to the terminal level and the P_0，preThe correspondence between the quantized values, P, from the arrangement to itself_0，preSelecting P corresponding to the terminal level of the user from the multiple quantized values_0，preQuantizing the value to obtain P adapted to self requirement_0，pre。

In the above scheme, the terminal configures the P to itself according to the configuration_0，preOne or more quantized values of, and dP_rampupTo obtain P adapted to its own needs_0，preAnd dP_rampupThe method comprises the following steps:

dividing the terminal into a plurality of terminal levels according to the self-demand of the terminal, and establishing the terminal level and P_0，preThe corresponding relation between the quantized values is stored in the terminal; the terminal determines the terminal level according to the requirement of the terminal, and then determines the terminal level according to the terminal level and the P_0，preThe correspondence between the quantized values, P, from the arrangement to itself _0，preSelecting P corresponding to the terminal level of the user from the multiple quantized values_0，preQuantizes the value and determines the power adjustment quantity delta adapting to the length requirement of the code word of the random access signaling_preFrom the selected P_0，preQuantized value and the power adjustment amount delta_preTo obtain P adapted to its own needs_0，pre。

In the above scheme, the power adjustment quantity Δ adapted to the length requirement of the self random access signaling code word is determined_preThe method comprises the following steps:

presetting the code length and each power regulation delta of random access signaling_preThe terminal obtains the power adjustment quantity delta adapting to the code word length requirement of the random access signaling according to the code word length of the random access signaling to be sent by the terminal and the pre-configured mapping relation_pre。

In the above scheme, the terminal configures the P to itself according to the configuration_0，preOne or more quantized values of, and dP_rampupTo obtain P adapted to its own needs_0，preAnd dP_rampupThe method comprises the following steps:

dividing the terminal into a plurality of terminal levels according to the self-requirements of the terminal, and establishing the terminal levels and the dP_rampupThe corresponding relation between the quantized values is stored in the terminal; the terminal determines the terminal grade according to the requirement of the terminal, and then determines the dP according to the terminal grade _rampupCorrespondence between quantized values, dP from arrangement to itself_rampupSelecting dP corresponding to own terminal level from the multiple quantized values_rampupQuantizing the value to obtain dP meeting the requirement_rampup。

In the above solution, the self-requirement of the terminal includes: the access delay requirement of the terminal, and/or the service type supported by the terminal, and/or the moving speed of the terminal.

In the above scheme, the terminal obtains the P meeting the self-demand_0，preAnd dP_rampupObtaining the transmitting power P of the PRACH_PRACHThe method comprises the following steps:

the terminal adapts to the P of the self-demand according to the obtained P_0，preAnd dP_rampupObtaining the power P expected to be received by the base station on the PRACH_{Receive_Target_Power}And then from the obtained P_{Receive_Target_Power}Obtaining the transmitting power P of the PRACH_PRACH。

In the above scheme, the terminal obtains its own transmission power P on the PRACH_PRACHThereafter, the method further comprises:

the terminal according to the obtained P_PRACHConfiguring self-transmitting power, sending a random access signaling to a base station on the PRACH, and obtaining P suitable for self-demand again when not receiving a response signaling which is returned by the base station and aims at the random access signaling_0，preAnd dP_rampupAnd its own transmission power P on the PRACH _PRACHAnd reconfiguring itselfTransmitting power and sending a random access signaling to a base station on the PRACH.

And receiving a response signaling aiming at the random access signaling returned by the base station after the terminal sends the random access signaling.

The invention also provides a power control device of the PRACH, and the device comprises: a first obtaining unit and a second obtaining unit; wherein,

a first obtaining unit, configured to obtain, according to a power P initially received by a base station configured to a terminal, on a PRACH allocated to the terminal_0，preAnd a power up step size dP at retransmission of the random access signaling_rampupTo obtain P adapted to the terminal requirements_0，preAnd dP_rampup；

A second obtaining unit, configured to obtain the P meeting the terminal requirement according to the P obtained by the first obtaining unit_0，preAnd dP_rampupObtaining the transmitting power P of the terminal on the PRACH_PRACH。

In the above solution, the apparatus further includes a configuration unit, configured to configure P on the terminal_0，preOne or more quantized values of, and dP_rampupOne or more quantized values of (a);

the first obtaining unit is further configured to obtain P configured by the configuration unit_0，preOne or more quantized values of, and dP _rampupTo obtain P adapted to the terminal requirements_0，preAnd dP_rampup。

In the foregoing solution, the configuration unit is further configured to acquire and store configuration information of a PRACH sent by a base station, where the configuration information of the PRACH includes P_0，preOne or more of the quantized values of (1) and (dP)_rampupOne or more quantized values of (a); and/or, by standard default configuration to the terminal P_0，preOne or more of the quantized values of (1) and (dP)_rampupOne or more quantized values of (a).

In the foregoing scheme, the first obtaining unit is further configured to divide the terminal into multiple terminal levels according to a requirement of the terminal, and establish the terminal level and the P_0，preThe corresponding relation among all quantized values is stored; determining the terminal level of the terminal according to the access delay requirement of the terminal, and then determining the terminal level and P according to the terminal level_0，preCorrespondence between quantized values, P configured from the configuration unit_0，preSelecting P corresponding to a terminal level of the terminal from among the plurality of quantized values_0，preQuantizing the value to obtain P adapted to the time delay requirement of the terminal_0，pre。

In the foregoing solution, the first obtaining unit is further configured to divide the terminal into a plurality of terminal levels according to a requirement of the terminal, and establish the terminal level and the P_0，preThe corresponding relation among all quantized values is stored; determining the terminal level of the terminal according to the access delay requirement of the terminal, and then determining the terminal level and P according to the terminal level _0，preCorrespondence between quantized values, P configured from the configuration unit_0，preSelecting P corresponding to a terminal level of the terminal from among the plurality of quantized values_0，preQuantizing the value and determining a power adjustment delta that accommodates the length requirement of the random access signaling codeword for the terminal_preFrom the selected P_0，preQuantized value and the power adjustment amount delta_preTo obtain P adapted to the delay requirement of the terminal_0，pre。

In the foregoing solution, the first obtaining unit is further configured to pre-configure a codeword length and each power adjustment Δ of a random access signaling_preAccording to the code word length of the random access signaling to be sent by the terminal, the pre-configured mapping relation is used for obtaining the power adjustment quantity delta adapting to the code word length requirement of the random access signaling of the terminal_pre。

In the foregoing scheme, the first obtaining unit is further configured toThe terminal is divided into a plurality of terminal levels according to the requirements of the terminal, and the terminal levels and the dP are established_rampupThe corresponding relation among all quantized values is stored; determining the terminal grade of the terminal according to the access time delay requirement of the terminal, and then determining the terminal grade and the dP according to the terminal grade_rampupCorrespondence between quantized values, dP arranged from the arrangement unit _rampupSelecting a dP corresponding to a terminal level of the terminal among the plurality of quantized values_rampupQuantizing the value to obtain dP meeting the terminal delay requirement_rampup。

In the foregoing solution, the second obtaining unit is further configured to obtain, according to the P meeting the terminal requirement obtained by the first obtaining unit_0，preAnd dP_rampupObtaining the power P expected to be received by the base station on the PRACH_{Receive_Target_Power}And then from the obtained P_{Receive_Target_Power}Obtaining the transmitting power P of the terminal on the PRACH_PRACH。

In the above solution, the apparatus further comprises: a sending unit and a verification unit, wherein,

a sending unit, configured to obtain P according to the second obtaining unit_PRACHConfiguring the transmitting power of the terminal and sending a random access signaling to a base station on the PRACH;

a verification unit, configured to restart the first obtaining unit, the second obtaining unit, and the sending unit when a response signaling to the random access signaling sent by the sending unit is not received, and obtain a P meeting the terminal delay requirement again_0，preAnd dP_rampupAnd the transmitting power P of the terminal on the PRACH_PRACHAnd reconfiguring the transmitting power of the terminal and sending a random access signaling to the base station on the PRACH.

The PRACH power control method and the device provided by the invention configure the power P which is expected to be initially received by the base station on the PRACH distributed for the terminal_0，preAnd a power up step size dP at retransmission of the random access signaling_rampupSo that the terminal can obtain P suitable for its own requirement_0，preAnd dP_rampupBased on the obtained emission power P of the terminal on the PRACH_PRACHThe method can meet the time delay requirement of the terminal, and can configure the power control parameter which is suitable for the time delay requirement of the terminal according to different types of mobile data services, thereby meeting the requirements of different users on access time delay, improving the access network speed of the user, reducing the access time delay of the user and further improving the satisfaction degree of the user while realizing the control of the terminal transmitting power.

Drawings

Fig. 1 is a flow chart of an implementation of the PRACH power control method of the present invention;

fig. 2 is a schematic diagram of a configuration of a PRACH power control apparatus according to the present invention.

Detailed Description

The basic idea of the invention is: power P expected to be initially received by the base station on the PRACH allocated to the terminal_0，preAnd a power up step length dP in retransmission of random access signaling _rampupQuantizing into one or more values, and configuring to the terminal; the terminal selects P suitable for the requirement of initial access time delay_0，preQuantized values, and dP_rampupQuantize the value and according to the selected P_0，preQuantized values, and dP_rampupDetermines the transmission power P on the PRACH of the user_PRACHTherefore, the power control of the terminal can adapt to the access delay requirements of different users and different mobile data services.

Referring to fig. 1, the method for controlling PRACH power of the present invention mainly includes the following steps:

step 102: the terminal expects the power P initially received on the PRACH allocated for the terminal according to the base station configured by the terminal_0，preAnd a power up step size dP at retransmission of the random access signaling_rampupTo obtain P adapted to its own needs_0，preAnd dP_rampup；

Step 103: the terminal adapts to the P of the self-demand according to the obtained P_0，preAnd dP_rampupObtaining the transmitting power P of the PRACH_PRACH。

Wherein, before step 102, the method further comprises the steps of:

step 101: configuring, on a terminal, a power P that a base station expects to initially receive on a PRACH allocated for the terminal_0，preAnd a power up step size dP at retransmission of the random access signaling _rampupOne or more quantized values of (a).

Specifically, the base station assigns a power P that the base station expects to initially receive on the PRACH assigned to the terminal_0，preDividing into one or more quantized values, and retransmitting the power up step size dP_rampupDividing into one or more quantized values; a terminal acquires and stores configuration information of PRACH (physical random Access channel) sent by a base station, wherein the configuration information of the PRACH comprises P_0，preOne or more of the quantized values of (1) and (dP)_rampupOne or more quantized values of (a).

Here, the configuration information of the PRACH may also be configured by a standard default and stored in the terminal.

Specifically, in the process of adding P_0，preWhen the quantized values are allocated to the terminal, the terminal obtains P suitable for the self time delay requirement in step 102_0，preThe method can be realized by the following two ways:

the first method is as follows: dividing the terminal into a plurality of terminal levels according to the requirements of the terminal, and establishing the terminal levelsRespectively with P_0，preThe corresponding relation between the quantized values is stored in the terminal; the terminal determines the terminal grade according to the access time delay requirement of the terminal, and then determines the terminal grade according to the terminal grade and the P_0，preThe correspondence between the quantized values, P, from the arrangement to itself_0，preSelecting P corresponding to the terminal level of the user from the multiple quantized values _0，preQuantizing the value to obtain P adapted to self requirement_0，pre。

The second method comprises the following steps: dividing the terminal into a plurality of terminal levels according to the requirements of the terminal, and establishing the terminal levels and P_0，preThe corresponding relation between the quantized values is stored in the terminal; the terminal determines the terminal grade according to the access time delay requirement of the terminal, and then determines the terminal grade according to the terminal grade and the P_0，preThe correspondence between the quantized values, P, from the arrangement to itself_0，preSelecting P corresponding to the terminal level of the user from the multiple quantized values_0，preQuantizes the value and determines the power adjustment quantity delta adapting to the length requirement of the code word of the random access signaling_preFrom the selected P_0，preQuantized value and the power adjustment amount delta_preTo obtain P adapted to its own needs_0，pre。

Here, the power adjustment amount Δ is determined_preThe process comprises the following steps: presetting the code length and each power regulation delta of random access signaling_preThe terminal obtains the power adjustment quantity delta adaptive to the self-demand through the pre-configured mapping relation according to the code word length of the random access signaling to be sent by the terminal_pre。

Specifically, in the process of dP_rampupWhen the quantized values are allocated to the terminal, the terminal obtains dP suitable for its own requirement in step 102 _rampupThe method can be realized by the following steps: dividing the terminal into a plurality of terminal levels according to the access delay requirement of the terminal, and establishing the terminal levels and the dP_rampupThe corresponding relation between the quantized values is stored in the terminal; the terminal according to the access delay requirement of itself,determining the terminal level of the terminal, and then according to the terminal level and the dP_rampupCorrespondence between quantized values, dP from arrangement to itself_rampupSelecting dP corresponding to own terminal level from the multiple quantized values_rampupQuantizing the value to obtain dP meeting the requirement_rampup。

In practical application, the terminal level and the dP can be established simultaneously_rampupCorrespondence between quantized values, and terminal level and P_0，preAnd storing the corresponding relation among the quantized values to the terminal. Wherein the terminal level and dP_rampupThe corresponding relation between the quantized values may be one-to-one or multiple-to-one, and the terminal level and P are_0，preThe corresponding relationship between the quantized values may also be a one-to-one correspondence or a multiple-to-one correspondence, which may be determined specifically according to actual needs.

Specifically, in step 102, P is added_0，preWhen the quantized value is allocated to the terminal, the terminal directly allocates the P to the terminal_0，preAs P is suitable for its own requirement _0，pre(ii) a In the process of dP_rampupWhen the quantized value is allocated to the terminal, the terminal directly allocates the dP to the terminal_rampupAs dP to suit its own needs_rampup。

Specifically, step 103 may include: the terminal adapts to the P of the self-demand according to the obtained P_0，preAnd dP_rampupObtaining the power P expected to be received by the base station on the PRACH_{Receive_Target_Power}And then from the obtained P_{Receive_Target_Power}Obtaining the transmitting power P of the PRACH_PRACH。

Here, the requirements of the terminal may include: the access delay requirement of the terminal, and/or the service type supported by the terminal, and/or the moving speed of the terminal.

After step 103, the method may further comprise: the terminal according toObtained P_PRACHConfiguring self transmitting power, sending random access signaling to a base station on the PRACH, and obtaining P suitable for self time delay requirement again when not receiving response signaling returned by the base station and aiming at the random access signaling_0，preAnd dP_rampupAnd its own transmission power P on the PRACH_PRACHAnd after the random access signaling is sent, receiving a response signaling which is returned by the base station and aims at the random access signaling.

Correspondingly, the present invention further provides a device for controlling PRACH power, as shown in fig. 2, the device includes: a first obtaining unit 22 and a second obtaining unit 23; wherein, the first obtaining unit 22 is used for obtaining P configured to the terminal _0，preOne or more quantized values of, and dP_rampupTo obtain P adapted to the terminal requirements_0，preAnd dP_rampup(ii) a A second obtaining unit 23, configured to obtain the P meeting the terminal requirement according to the first obtaining unit 22_0，preAnd dP_rampupObtaining the transmitting power P of the terminal on the PRACH_PRACH。

Wherein, as shown in fig. 2, the apparatus may further include a configuration unit 21 for configuring P on the terminal_0，preOne or more quantized values of, and dP_rampupOne or more quantized values of (a); a first obtaining unit 22, further configured to obtain P configured by the configuration unit 21_0，preOne or more quantized values of, and dP_rampupTo obtain P adapted to the terminal requirements_0，preAnd dP_rampup；

Specifically, the configuration unit 21 may be configured to acquire and store configuration information of a PRACH sent by a base station, where the configuration information of the PRACH includes P_0，preOne or more of the quantized values of (1) and (dP)_rampupOne or more quantized values of (a); and/or, by standard default configuration to the terminal P_0，preOne or more of the quantized values of (1) and (dP)_rampupOne or more quantized values of。

Specifically, the first obtaining unit 22 is further configured to divide the terminal into a plurality of terminal levels according to the terminal requirement, and establish the terminal level and P _0，preThe corresponding relation among all quantized values is stored; determining the terminal level of the terminal according to the requirement of the terminal, and then determining the terminal level and P according to the terminal level_0，preCorrespondence between quantized values, P arranged from the arranging unit 21_0，preSelecting P corresponding to a terminal level of the terminal from among the plurality of quantized values_0，preQuantized value to obtain P adapted to the requirements of the terminal_0，pre。

Specifically, the first obtaining unit 22 is further configured to divide the terminal into a plurality of terminal levels according to the terminal requirement, and establish the terminal level and P_0，preThe corresponding relation among all quantized values is stored; determining the terminal level of the terminal according to the requirement of the terminal, and then determining the terminal level and P according to the terminal level_0，preCorrespondence between quantized values, P arranged from the arranging unit 21_0，preSelecting P corresponding to a terminal level of the terminal from among the plurality of quantized values_0，preQuantizing the value and determining a power adjustment delta that accommodates the length requirement of the random access signaling codeword for the terminal_preFrom the selected P_0，preQuantized value and the power adjustment amount delta_preTo obtain P adapted to the terminal requirements_0，pre。

Here, the first obtaining unit 22 is further configured to pre-configure the code word length and each power adjustment Δ of the random access signaling _preAccording to the code word length of the random access signaling to be sent by the terminal, the pre-configured mapping relation is used for obtaining the power adjustment quantity delta adapting to the code word length requirement of the random access signaling of the terminal_pre。

Specifically, the first obtaining unit 22 is further configured to divide the terminal into a plurality of terminal levels according to the terminal requirement, and establish the terminal level and the dP_rampupThe corresponding relation among all quantized values is stored; determining the terminal grade of the terminal according to the requirement of the terminal, and then determining the terminal grade and the dP according to the terminal grade_rampupCorrespondence between quantized values, dP arranged from the arrangement unit 21_rampupSelecting a dP corresponding to a terminal level of the terminal among the plurality of quantized values_rampupQuantizing the value to obtain dP adapted to the terminal requirements_rampup。

Specifically, the second obtaining unit 23 is further configured to obtain P meeting the terminal requirement according to the P obtained by the first obtaining unit 22_0，preAnd dP_rampupObtaining the power P expected to be received by the base station on the PRACH_{Receive_Target_Power}And then from the obtained P_{Receive_Target_Power}Obtaining the transmitting power P of the terminal on the PRACH_PRACH。

Wherein the apparatus further comprises: a sending unit 24 and a verification unit 25, wherein the sending unit 24 is used for obtaining P according to the second obtaining unit 23 _PRACHConfiguring the transmitting power of the terminal and sending a random access signaling to a base station on the PRACH; a verification unit 25, configured to restart the first obtaining unit 22, the second obtaining unit 23, and the sending unit 24 when a response signaling, which is returned by the base station and is specific to the random access signaling sent by the sending unit, is not received, and obtain the P meeting the requirement of the terminal again_0，preAnd dP_rampupAnd the transmitting power P of the terminal on the PRACH_PRACHAnd reconfiguring the transmitting power of the terminal and sending a random access signaling to the base station on the PRACH.

In practical application, the device can be arranged on a terminal to realize the control of the PRACH power of the terminal.

Example one

In this example, the terminal (MS _1) and the base station (BS _1) complete downlink synchronization, and the MS _1 has successfully received the system configuration information sent by the BS _1, where the system configuration information at least includes configuration information for PRACH power control.

In this embodiment, BS _1 may include uniformly configured P in the configuration information of PRACH power control_0，preAnd dP_rampupI.e. P_0，preAnd dP_rampupAre divided into a quantized value and are configured on each terminal (including MS _ 1).

In this embodiment, a specific procedure for implementing PRACH power control of MS _1 may include the following steps:

Step 201: MS _1 obtains the power P expected to be initially received by BS _1 on the PRACH allocated to the terminal from the configuration information of the PRACH power control sent by BS _1_0，preAnd the power up step length dP in the retransmission of random access signaling_rampupWherein P is_0，preAnd dP_rampupThe units of (A) are dBm;

step 202: MS _1 from the obtained P_0，preAnd dP_rampupObtaining the power P expected to be received by BS _1 on the PRACH according to the formula (1)_{Receive_Target_Power}；

P_{Receive_Target_Power}＝P_0，pre+(N_pre-1)dP_rampup (1)

Wherein, P_{Receive_Target_Power}Has the unit of dBm, N_preIndicates the number of times that MS _1 has sent random access signaling, N, when first sent_pre＝1。

Step 203: MS _1 from the obtained P_{Receive_Target_Power}Determining the transmitting power P of MS _1 on the PRACH according to the formula (2)_PRACH；

$P_{\mathrm{PRACH}}=\min \{P_{c\max ,c}^{\mathrm{MS}1},{\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HDA0000060446100000011.png"\; state="\{\{state\}\}">P</figure-callout>}}_{0,\mathrm{pre}}+{\mathrm{PL}}_c^{\mathrm{MS}1}+(N_{\mathrm{pre}}-1){\mathrm{dP}}_{\mathrm{rampup}}\}$ (2)

$=\min \{P_{c\max ,c}^{\mathrm{MS}1},P_{\mathrm{Receive}\_T\arg \mathrm{et}\_\mathrm{Power}}+{\mathrm{PL}}_c^{\mathrm{MS}1}\}$

Wherein: p_PRACHHas the unit dBm, P_cmax，cThe maximum transmit power (in dBm) configured for MS _1 on carrier frequency c,

the downlink pathloss value (in dB) estimated for MS _1 on carrier c;

here, the present step further includes: if obtained, is

Also adds the N_preThe value of (b) is modified to 0.

Step 204: MS _1 according to P_PRACHAnd configuring the transmission power on the PRACH allocated by the BS _1 for the BS _1, and sending a random access signaling to the BS _1 on the PRACH.

Step 205: if the MS _1 receives a response signaling which is returned by the BS _1 and aims at the random access signaling, performing subsequent operation according to the received response signaling; if MS _1 does not receive the response signaling returned by BS _1, then N is carried out _prePlus 1 and return to execute step 2.

Example two

In this example, downlink synchronization is completed between MS _1 and BS _1, and MS _1 has successfully received the system configuration information sent by BS _1, where the system configuration information at least includes configuration information for PRACH power control.

In this embodiment, BS _1 configures the same dP for all terminals_rampupA 1 is to P_0，preQuantised to N values, i.e. to

Configured to each terminal, N is a positive integer greater than or equal to 1, i.e. dP_rampupDividing into a quantized value, dividing P into_0，preThe value was divided into N quantization values.

In this embodiment, a specific procedure for implementing PRACH power control of MS _1 may include the following steps:

step 301: MS _1 obtains dP from PRACH power control configuration information sent by BS _1_rampupAnd quantized to N values

Namely, it is

Step 302: MS _1 obtains P quantized into N values according to a predetermined principle_0，preTo meet self-demand

Wherein the predetermined principle is: according to the initial access delay requirement of the terminal, and/or according to the service types supported by the terminal, and/or according to the moving speed of the terminal, the terminal can be divided into K levels (Type1, Type 2.., Type K), and each terminal level and P can be predetermined_0，preFor example, one or more levels of terminal correspondences P may be specified _0，preCan also specify a level terminal corresponding to P_0，preA quantized value of (a). Wherein each terminal level and P_0，preThe corresponding relation between the quantized values can be sent to the terminal by standard default configuration or by BS _1 through a downlink channel. For example, MS _1 is ranked as TypeK, and the TypeK corresponds to the MS _1 according to a predetermined rule

Then

Wherein, the predetermined principle may also be:

(1) determining the temporary value of the power expected to be initially received by the BS _1 on the PRACH allocated to the MS _1 according to the initial access delay requirement of the MS _1, and/or according to the service type supported by the MS _1, and/or according to the moving speed of the MS _1

Specifically, the terminal is divided into K levels (Type1, Type 2.., Type K) in advance according to the initial access delay requirement of the terminal, and/or according to the service types supported by the terminal, and/or according to the moving speed of the terminal, andassociating the divided terminal level with P_0，preCorresponding to the quantization level of (c). Wherein the terminal level and P_0，preThe corresponding relation of the quantization levels is sent to the terminal by standard default configuration or BS _1 through a downlink channel;

for example, MS _1 is ranked as TypeK, and TypeK corresponds to P_0，preHas a quantization level ofThen the initial received power nonce on PRACH is set

(2) Determining the adjustment quantity delta of the power initially received by the MS _1 on the PRACH according to the code word length of the random access signaling to be sent by the MS _1_pre；

Specifically, the mapping relationship between the codeword length of the random access signaling and the power adjustment amount may be preconfigured, and the mapping relationship is configured by a standard default or sent to the terminal by the base station through a downlink channel;

in this embodiment, MS _1 determines that its own power adjustment amount is equal to the code length of the random access signaling and the mapping relationship between the power adjustment amounts

(3) Finally, according to

And

determining the initial received power on PRACH according to equation (3)

<math> <mrow> <msubsup> <mi>P</mi> <mrow> <mn>0</mn> <mo>,</mo> <mi>pre</mi> </mrow> <mrow> <mi>MS</mi> <mn>1</mn> </mrow> </msubsup> <mo>=</mo> <mi>Tmp</mi> <mo>_</mo> <msubsup> <mi>P</mi> <mrow> <mn>0</mn> <mo>,</mo> <mi>pre</mi> </mrow> <mrow> <mi>MS</mi> <mn>1</mn> </mrow> </msubsup> <mo>+</mo> <msubsup> <mi>&Delta;</mi> <mi>pre</mi> <mrow> <mi>MS</mi> <mn>1</mn> </mrow> </msubsup> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </math>

And step 3: basically the same as step 2 in the first embodiment, except that the method obtained by the above steps in the first embodiment

Instead of P in the formula (1)_0，preCalculating the expected received power of BS _1 on PRACH allocated for MS _1

And 4, step 4: basically the same as step 3 in the first embodiment, except that the product obtained by the above steps in the first embodiment

Instead of P in the formula (2)_{Receive_Target_Power}And calculating the transmitting power of the MS _1 on the PRACH allocated by the BS _1 to the MS _1

Here, the present step further includes: if obtained, is

And also N_preThe value of (b) is modified to 0.

And 5: MS _1 is as describedAnd configuring the transmission power on the PRACH allocated by the BS _1 for the BS _1, and sending a random access signaling to the BS _1 on the PRACH.

Step 6: exactly the same as step 5 in the first embodiment.

EXAMPLE III

In this example, MS _1 has successfully received system configuration information from BS _1, where the system configuration information at least includes configuration information for PRACH power control.

In this embodiment, BS _1 configures the same P for all terminals_0，preWill dP_rampupQuantized to M values, i.e. quantized to

Configured to each terminal, M is a positive integer greater than or equal to 1, namely P_0，preDividing into a quantized value, dividing dP_rampupDivided into M quantized values.

In this embodiment, a specific procedure for implementing PRACH power control of MS _1 may include the following steps:

step 1: MS _1 obtains P from PRACH power control configuration information sent by BS _1_0，preAnd quantized to M valuesNamely, it is

Step 2: MS _1 quantizes dP to M values according to a predetermined rule_rampupSelected to be allocated for MS _1

In this embodiment, the predetermined rule is: according to the initial access delay requirement of the terminal, and/or according to the service types supported by the terminal, and/or according to the moving speed of the terminal, the terminal can be divided into K levels (Type1, Type 2.., Type K), and each terminal level and dP are predetermined_rampupMay specify one or more levels of terminal correspondence dP, for example _rampupCan also specify a level terminal corresponding to the dP_rampupA quantized value of (a). Wherein the terminal levels and dP_rampupThe corresponding relation between the quantized values can be sent to the terminal by standard default configuration or by BS _1 through a downlink channel.

For example, MS _1 is ranked as TypeK, and the TypeK corresponds to the MS _1 according to a predetermined rule

Then ${\mathrm{dP}}_{\mathrm{rampup}}^{\mathrm{MS}1}={\mathrm{dP}}_{\mathrm{rampup}}^M;$

And step 3: basically the same as step 2 in the first embodiment, except that the method obtained by the above steps in the first embodiment

Instead of dP in formula (1)_rampupCalculating the expected received power of BS _1 on PRACH allocated for MS _1

And 4, step 4: step 3 in the first embodimentThe same, except that, in this example, the above-mentioned steps were used to obtain

Instead of P in the formula (2)_{Receive_Target_Power}And calculating the transmitting power of the MS _1 on the PRACH allocated by the BS _1 to the MS _1

Wherein, the carrier frequency c is the carrier frequency of the PRACH of BS _ 1. If it is notThen N will be_preThe value of (A) is modified to 0;

and 5: MS _1 is as described

And configuring the transmission power on the PRACH allocated by the BS _1 for the BS _1, and sending a random access signaling to the BS _1 on the PRACH.

Step 6: exactly the same as step 5 in the first embodiment.

Example four

In this example, MS _1 has successfully received system configuration information from BS _1, where the system configuration information at least includes configuration information for PRACH power control.

In this embodiment, BS _1 will dP_rampupQuantized to M values, i.e. quantized to

And P is_0，preQuantised to N values, i.e. to

M, N are positive integers greater than or equal to 1, i.e. dP_rampupDividing into M quantized values, dividing P into_0，preThe value was divided into N quantization values.

The specific procedure for implementing the PRACH power control of the MS _1 in this embodiment may include the following steps:

step 1: MS _1 obtains dP quantized into M values from PRACH power control configuration information sent by BS _1_rampupAnd P quantized to N values_0，preI.e. by

And ${\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HDA0000060446100000011.png"\; state="\{\{state\}\}">P</figure-callout>}}_{0,\mathrm{pre}}^1,{\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HDA0000060446100000011.png"\; state="\{\{state\}\}">P</figure-callout>}}_{0,\mathrm{pre}}^2,...,{\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HDA0000060446100000011.png"\; state="\{\{state\}\}">P</figure-callout>}}_{0,\mathrm{pre}}^N;$

step 2: MS _1 is based on a predetermined principle, based on P_0，preIs assigned to itself from among the N quantization values of

And from dP_rampupIs selected to be allocated for itself among the M quantized values

Here, for P_0，preThe predetermined principle of selecting the N quantization values is the same as the predetermined principle and the specific implementation manner of step 2 in the second embodiment, and is directed to dP_rampupThe predetermined principle for selecting the M quantization values is the same as the predetermined principle and the specific implementation manner of step 2 in the third embodiment, and is not described herein again.

In this embodiment, the final selection results in:

and step 3: basically the same as step 2 in the first embodiment, except that the method obtained by the above steps in the first embodiment

Instead of dP in formula (1) _rampupObtained by the above steps

Instead of P in the formula (1)_0，preCalculating the expected received power of BS _1 on PRACH allocated for MS _1 $P_{\mathrm{Receive}\_T\arg \mathrm{et}\_\mathrm{Power}}^{\mathrm{MS}1};$

And 4, step 4: basically the same as step 3 in the first embodiment, except that the product obtained by the above steps in the first embodiment

Instead of P in the formula (2)_{Receive_Target_Power}And calculating the transmitting power of the MS _1 on the PRACH allocated by the BS _1 to the MS _1

In this embodiment, the carrier frequency c is the carrier frequency of the PRACH channel of the MS _1, if

Then N will be_preThe value of (b) is modified to 0.

And 5: MS _1 is as described

And configuring the transmission power on the PRACH allocated by the BS _1 for the BS _1, and sending a random access signaling to the BS _1 on the PRACH.

Step 6: exactly the same as step 5 in the first embodiment.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (19)

1. A method for power control of a random access channel (PRACH), the method comprising:

the terminal expects the power P initially received on the PRACH allocated for the terminal according to the base station configured to the terminal_0，preAnd a power up step size dP at retransmission of the random access signaling_rampupTo obtain P adapted to its own needs_0，preAnd dP_rampup；

The terminal adapts to the P of the self-demand according to the obtained P_0，preAnd dP_rampupObtaining the transmitting power P of the PRACH_PRACH。

2. The method of power control of the PRACH of claim 1, wherein the method further comprises: configuring P on the terminal_0，preOne or more quantized values of, and dP_rampupOne or more quantized values of (a).

3. The method for power control of PRACH as claimed in claim 2, characterised in that P is configured on the terminal_0，preOne or more quantized values of, and dP_rampupComprises:

the terminal acquires and stores configuration information of a PRACH (physical random Access channel) sent by a base station to the terminal, wherein the configuration information of the PRACH comprises P_0，preOne or more of the quantized values of (1) and (dP)_rampupOne or more quantized values of (a); or, by standard default configuration to the terminal P _0，preOne or more of the quantized values of (1) and (dP)_rampupOne or more quantized values of (a).

4. The method of claim 1, wherein the terminal performs power control according to P configured to itself_0，preOne or more quantized values of, and dP_rampupTo obtain P adapted to its own needs_0，preAnd dP_rampupThe method comprises the following steps:

dividing the terminal into a plurality of terminal levels according to the self requirements of the terminal, and establishing the terminal levels and P_0，preThe corresponding relation between the quantized values is stored in the terminal; the terminal determines the terminal level according to the requirement of the terminal, and then determines the terminal level according to the terminal level and the P_0，preThe correspondence between the quantized values, P, from the arrangement to itself_0，preSelecting P corresponding to the terminal level of the user from the multiple quantized values_0，preQuantizing the value to obtain P adapted to self requirement_0，pre。

5. The method of claim 1, wherein the terminal performs power control according to P configured to itself_0，preOne or more quantized values of, and dP_rampupTo obtain P adapted to its own needs_0，preAnd dP_rampupThe method comprises the following steps:

dividing the terminal into a plurality of terminal levels according to the self-demand of the terminal, and establishing the terminal level and P_0，preThe corresponding relation between the quantized values is stored in the terminal; the terminal determines the terminal level according to the requirement of the terminal, and then determines the terminal level according to the terminal level and the P _0，preThe correspondence between the quantized values, P, from the arrangement to itself_0，preSelecting P corresponding to the terminal level of the user from the multiple quantized values_0，preQuantizes the value and determines the power adjustment quantity delta adapting to the length requirement of the code word of the random access signaling_preFrom the selected P_0，preQuantized value and the power adjustment amount delta_preTo obtain P adapted to its own needs_0，pre。

6. The method for power control of PRACH according to claim 4, characterized in that said determining the power adjustment Δ adapted to the length requirement of the self-random access signaling codeword_preThe method comprises the following steps:

presetting the code length and each power regulation delta of random access signaling_preThe terminal obtains the power adjustment quantity delta adapting to the code word length requirement of the random access signaling according to the code word length of the random access signaling to be sent by the terminal and the pre-configured mapping relation_pre。

7. The method of claim 1, wherein the terminal performs power control according to P configured to itself_0，preOne or more quantized values of, and dP_rampupTo obtain one or more quantized values ofP adapted to self-demand_0，preAnd dP_rampupThe method comprises the following steps:

dividing the terminal into a plurality of terminal levels according to the self-requirements of the terminal, and establishing the terminal levels and the dP _rampupThe corresponding relation between the quantized values is stored in the terminal; the terminal determines the terminal grade according to the requirement of the terminal, and then determines the dP according to the terminal grade_rampupCorrespondence between quantized values, dP from arrangement to itself_rampupSelecting dP corresponding to own terminal level from the multiple quantized values_rampupQuantizing the value to obtain dP meeting the requirement_rampup。

8. The method for power control of PRACH as claimed in any one of claims 1 to 7, wherein the terminal's own requirements include: the access delay requirement of the terminal, and/or the service type supported by the terminal, and/or the moving speed of the terminal.

9. The method for power control of the PRACH as claimed in any one of claims 1 to 7, wherein the terminal adapts its own requirements according to the obtained P_0，preAnd dP_rampupObtaining the transmitting power P of the PRACH_PRACHThe method comprises the following steps:

the terminal adapts to the P of the self-demand according to the obtained P_0，preAnd dP_rampupObtaining the power P expected to be received by the base station on the PRACH_{Receive_Target_Power}And then from the obtained P_{Receive_Target_Power}Obtaining the transmitting power P of the PRACH_PRACH。

10. The method of claim 9, wherein the PRACH transmission power P is obtained at the terminal from the PRACH _PRACHThereafter, the method further comprises:

the terminal is as followsObtained P_PRACHConfiguring self-transmitting power, sending a random access signaling to a base station on the PRACH, and obtaining P suitable for self-demand again when not receiving a response signaling which is returned by the base station and aims at the random access signaling_0，preAnd dP_rampupAnd its own transmission power P on the PRACH_PRACHAnd reconfiguring the self transmitting power and sending a random access signaling to the base station on the PRACH.

And receiving a response signaling aiming at the random access signaling returned by the base station after the terminal sends the random access signaling.

11. An apparatus for power control of a PRACH, the apparatus comprising: a first obtaining unit and a second obtaining unit; wherein,

a first obtaining unit, configured to obtain, according to a power P initially received by a base station configured to a terminal, on a PRACH allocated to the terminal_0，preAnd a power up step size dP at retransmission of the random access signaling_rampupTo obtain P adapted to the terminal requirements_0，preAnd dP_rampup；

A second obtaining unit, configured to obtain the P meeting the terminal requirement according to the P obtained by the first obtaining unit _0，preAnd dP_rampupObtaining the transmitting power P of the terminal on the PRACH_PRACH。

12. The apparatus for power control of PRACH as claimed in claim 11, wherein the apparatus further comprises a configuration unit configured to configure P on a terminal_0，preOne or more quantized values of, and dP_rampupOne or more quantized values of (a);

the first obtaining unit is further configured to obtain P configured by the configuration unit_0，preOne or more quantized values of, and dP_rampupTo obtain P adapted to the terminal requirements_0，preAnd dP_rampup。

13. The apparatus of claim 12, wherein the configuration unit is further configured to acquire and store configuration information of the PRACH sent by a base station, and the configuration information of the PRACH includes P_0，preOne or more of the quantized values of (1) and (dP)_rampupOne or more quantized values of (a); and/or, by standard default configuration to the terminal P_0，preOne or more of the quantized values of (1) and (dP)_rampupOne or more quantized values of (a).

14. The apparatus for power control of PRACH as claimed in claim 11, wherein the first obtaining unit is further configured to divide a terminal into a plurality of terminal classes according to a requirement of the terminal, and establish the terminal class and P_0，preThe corresponding relation among all quantized values is stored; determining the terminal level of the terminal according to the access delay requirement of the terminal, and then determining the terminal level and P according to the terminal level _0，preCorrespondence between quantized values, P configured from the configuration unit_0，preSelecting P corresponding to a terminal level of the terminal from among the plurality of quantized values_0，preQuantizing the value to obtain P adapted to the time delay requirement of the terminal_0，pre。

15. The apparatus for power control of PRACH as claimed in claim 11, wherein the first obtaining unit is further configured to divide a terminal into a plurality of terminal classes according to a requirement of the terminal, and establish the terminal class and P_0，preThe corresponding relation among all quantized values is stored; determining the terminal level of the terminal according to the access delay requirement of the terminal, and then determining the terminal level and P according to the terminal level_0，preCorrespondence between quantized values, P configured from the configuration unit_0，preSelecting P corresponding to a terminal level of the terminal from among the plurality of quantized values_0，preQuantizing the value and determining a power adjustment delta that accommodates the length requirement of the random access signaling codeword for the terminal_preFromSelected P_0，preQuantized value and the power adjustment amount delta_preTo obtain P adapted to the delay requirement of the terminal_0，pre。

16. The power control device of the PRACH of claim 15, wherein the first obtaining unit is further configured to pre-configure a codeword length and each power adjustment Δ of a random access signaling _preAccording to the code word length of the random access signaling to be sent by the terminal, the pre-configured mapping relation is used for obtaining the power adjustment quantity delta adapting to the code word length requirement of the random access signaling of the terminal_pre。

17. The apparatus for power control of PRACH as claimed in claim 11, wherein the first obtaining unit is further configured to divide a terminal into a plurality of terminal classes according to a requirement of the terminal, and establish the terminal class and dP_rampupThe corresponding relation among all quantized values is stored; determining the terminal grade of the terminal according to the access time delay requirement of the terminal, and then determining the terminal grade and the dP according to the terminal grade_rampupCorrespondence between quantized values, dP arranged from the arrangement unit_rampupSelecting a dP corresponding to a terminal level of the terminal among the plurality of quantized values_rampupQuantizing the value to obtain dP meeting the terminal delay requirement_rampup。

18. The power control apparatus of PRACH as claimed in any one of claims 11 to 17, wherein the second obtaining unit is further configured to obtain P adapted to the terminal requirement according to the first obtaining unit_0，preAnd dP_rampupObtaining the power P expected to be received by the base station on the PRACH_{Receive_Target_Power}And then from the obtained P _{Receive_Target_Power}Obtaining the transmitting power P of the terminal on the PRACH_PRACH。

19. The power control apparatus of the PRACH of claim 18, wherein the apparatus further comprises: a sending unit and a verification unit, wherein,

a sending unit, configured to obtain P according to the second obtaining unit_PRACHConfiguring the transmitting power of the terminal and sending a random access signaling to a base station on the PRACH;

a verification unit, configured to restart the first obtaining unit, the second obtaining unit, and the sending unit when a response signaling to the random access signaling sent by the sending unit is not received, and obtain a P meeting the terminal delay requirement again_0，preAnd dP_rampupAnd the transmitting power P of the terminal on the PRACH_PRACHAnd reconfiguring the transmitting power of the terminal and sending a random access signaling to the base station on the PRACH.

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