CN102158941A - Power control method, equipment and system - Google Patents
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Abstract
The embodiment of the invention provides a power control method, power control equipment and a system. The power control method comprises the following steps of: transmitting power control command words of the former a-1 timeslots in a preset period of time to user equipment, so that the transmission power, regulated according to the power control command words of the former a-1 timeslots, of the user equipment is the same as the transmission power before the regulation performed according to the power control command word of the first timeslot, wherein the period of time at least comprises a timeslots, and a is more than or equal to 3; acquiring an estimated signal energy value of the ath timeslot; determining the power control command word of the ath timeslot according to the estimated signal energy value; and transmitting the power control command word of the ath timeslot to the user equipment. By the technical scheme, the user equipment can timely regulate the transmission power of the next timeslot to reduce the transmission delay of the next timeslot symbol.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a power control method, a power control device, and a power control system.
Background
With the rapid development of communication technology, Wideband Code Division Multiple Access (WCDMA) has been widely researched and applied in the global scope as one of the mainstream technologies of the third generation mobile communication system, and the uplink of the existing WCDMA system is basically obtained by performing Channel estimation using a pilot carried by a Dedicated Physical Control Channel (DPCCH) to obtain a Signal Interference Ratio (SIR).
In the existing WCDMA system, the base station calculates SIR once per timeslot, compares the calculated SIR with a threshold SIR, determines that a Transmit Power Control (TPC) command word is 0 if the measured SIR is greater than the threshold SIR, and sends the TPC-0 to the ue, and the ue reduces the Transmit Power of the next timeslot after receiving the TPC-0; and if the measured SIR is smaller than the threshold SIR, determining that the TPC command word is 1, and sending the TPC-1 to the user equipment, wherein the user equipment increases the transmission power of the next time slot after receiving the TPC-1.
The prior art has the following disadvantages:
now, the base station calculates SIR once per slot, compares the calculated SIR with a threshold SIR and determines a TPC command word, which requires a certain time to increase the delay of receiving the TPC command word by the ue, so that the ue cannot adjust the transmit power of the next slot in time and increase the delay of transmitting the symbol of the next slot.
Disclosure of Invention
Embodiments of the present invention provide a power control method, a power control device, and a power control system, which enable a user equipment to adjust a transmission power of a next time slot in time, and reduce a time delay for transmitting a symbol of the next time slot.
In view of this, the embodiment of the present invention provides:
a method of power control, comprising:
sending power control command words of the first a-1 time slots in a preset period to user equipment, and enabling the sending power of the user equipment after being adjusted according to the power control command words of the first a-1 time slots to be the same as the sending power of the user equipment before being adjusted according to the power control command words of the 1 st time slot; wherein the periodic time period comprises at least a time slots, and a is greater than or equal to 3;
acquiring a signal energy estimated value of the a-th time slot;
determining a power control command word of the a-th time slot according to the signal energy estimated value;
and transmitting the power control command word of the a-th time slot to the user equipment.
A power control apparatus comprising:
the saving unit is used for saving the power control command words of the first a-1 time slots in the preset cycle period; wherein the periodic time period comprises at least a time slots, and a is greater than or equal to 3;
a signal energy estimated value obtaining unit, configured to obtain a signal energy estimated value of an a-th time slot;
a power control command word determining unit, configured to determine a power control command word of an a-th time slot according to the signal energy estimation value;
a sending unit, configured to send the power control command word of the first a-1 time slots in the period to the user equipment, so that the sending power of the user equipment after being adjusted according to the power control command word of the first a-1 time slot is the same as the sending power of the user equipment before being adjusted according to the power control command word of the 1 st time slot; and transmitting the power control command word of the a-th time slot to the user equipment.
In the embodiment of the invention, the power control command word of the first a-1 time slots in the period sent to the user equipment by the power control equipment is the preset power control command word, and the power control command word of the a-th time slot in the period sent to the user equipment is obtained according to the signal energy estimated value of the a-th time slot, so that the power control command word is not required to be calculated by the power control equipment for each time slot, the sending power of the next time slot can be timely adjusted by the user equipment, and the time delay for sending the next time slot symbol is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a power control method according to an embodiment of the present invention;
FIG. 2 is a flow chart of a power control method according to another embodiment of the present invention;
FIG. 3 is a flow chart of a power control method according to another embodiment of the present invention;
fig. 4 is a block diagram of a power control apparatus according to an embodiment of the present invention;
fig. 5 is a system configuration diagram provided in the embodiment of the present invention.
Detailed Description
Referring to fig. 1, an embodiment of the invention provides a power control method, which includes:
101. sending power control command words of the first a-1 time slots in a preset period to user equipment, and enabling the sending power of the user equipment after being adjusted according to the power control command words of the first a-1 time slots to be the same as the sending power of the user equipment before being adjusted according to the power control command words of the 1 st time slot; wherein the periodic time period comprises at least a time slots, and a is greater than or equal to 3.
The execution subject of the embodiment of the present invention is a power control device, which may be a base station or other access devices, and does not affect the implementation of the present invention.
In an alternative embodiment, assuming that a is 3, the power control command word of the 1 st slot transmitted by the power control device to the user equipment instructs the user equipment to decrease the transmission power; the power control command word of the 2 nd time slot sent to the user equipment by the power control equipment indicates the user equipment to increase the transmission power; or the power control command word of the 1 st time slot sent to the user equipment by the power control equipment indicates the user equipment to increase the transmission power; the power control command word of the 2 nd time slot sent to the user equipment by the power control equipment indicates the user equipment to reduce the transmission power; thus, the transmission power of the user equipment is not adjusted corresponding to the first 2 time slots, and the transmission power control command word is also ensured to be transmitted in each time slot by being compatible with the existing protocol.
In another embodiment, a may be an odd number greater than or equal to 3, such as a being equal to 5, 7, etc. For example, when a equals 5, the power control command word of the first time slot sent by the power control device to the user equipment instructs the user equipment to decrease the transmission power, the power control command word of the second time slot sent by the power control device to the user equipment instructs the user equipment to increase the transmission power, and in the third and fourth time slots, respectively, only the user equipment decreases the transmission power first and then increases the transmission power.
Alternatively, a may be an even number, e.g., a equals 4 or 6. When a is equal to 4, in the first time slot, the second time slot and the third time slot, the power control device may send a power control command word instructing the user device to decrease the transmission power, a power control command word instructing the user device to increase the transmission power, and a power control command word instructing the user device to keep the transmission power unchanged to the user device.
102. And acquiring the estimated value of the signal energy of the a-th time slot.
It should be noted that: a DPCCH subframe and an E-DPCCH (Enhanced Dedicated Physical Data Channel) subframe are synchronously transmitted, the length of one E-DPCCH subframe can be 2ms, the E-DPCCH subframe comprises 3 time slots, and each time slot comprises 10 symbols; one DPCCH subframe may be 10ms in length and include 15 slots of 10 symbols each. In general, the power control apparatus receives a slot symbol of the E-DPCCH subframe at the same time as receiving a slot symbol of the DPCCH subframe, i.e., the slot symbol of the E-DPCCH subframe is received in synchronization with the slot symbol of the DPCCH subframe.
When a is 3, the specific implementation manner of the step is as follows: after receiving a part of symbols of a 3 rd time slot of an E-DPCCH sent by user equipment, determining a transport format combination indicator (E-TFCI) according to the received symbols of a 1 st time slot, symbols of a 2 nd time slot and parts of symbols of the 3 rd time slot of an E-DPCCH subframe, determining a pilot symbol of the 3 rd time slot of the E-DPCCH subframe according to the pilot symbol in the DPCCH subframe time slot synchronized with the 3 rd time slot of the E-DPCCH subframe, and determining a signal energy estimated value of the 3 rd time slot of the E-DPCCH subframe according to the E-TFCI and the pilot symbol of the 3 rd time slot of the E-DPCCH subframe, wherein the signal energy estimated value of the 3 rd time slot of the E-DPCCH: the difference between the biased signal energy estimated value of the 3 rd time slot of the E-DPCCH subframe and the noise energy estimated value of the 3 rd time slot of the E-DPCCH subframe is converted into a value after the energy level of the DPCCH subframe, and it can be understood that in the embodiment of the application, the signal energy estimated value of the 3 rd time slot of the E-DPCCH subframe is the unbiased signal energy estimated value of the 3 rd time slot of the E-DPCCH subframe; the specific way for determining the estimated value of the signal energy of the 3 rd time slot of the E-DPCCH sub-frame is as follows: acquiring a signal energy offset value corresponding to the E-TFCI; determining a biased signal energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame and a noise energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame according to a pilot symbol of the 3 rd time slot of the E-DPCCH sub-frame and a part of symbols of the 3 rd time slot; and obtaining the signal energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame according to the difference between the biased signal energy estimated value and the noise energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame and the signal energy bias value. Wherein the pilot symbols of the 3 rd slot of the E-DPCCH sub-frame are obtained from pilot symbols in the DPCCH sub-frame slot synchronized with the 3 rd slot of the E-DPCCH sub-frame.
When a is 5, as can be seen from the above description of the E-DPCCH subframe length, 5 slots already include 1 complete E-DPCCH subframe, and at this time, the specific implementation manner of this step is: directly utilizing E-TFCI corresponding to a previous complete E-DPCCH sub-frame to obtain a signal energy offset value, and then determining a biased signal energy estimated value of a 5 th time slot and a noise energy estimated value of the 5 th time slot according to a pilot symbol of the 5 th time slot and a part of symbols of the 5 th time slot in a periodic time period; and obtaining the estimated signal energy value of the 5 th time slot according to the difference between the estimated biased signal energy value of the 5 th time slot and the estimated noise energy value of the 5 th time slot and the signal energy bias value. Wherein, the pilot symbol of the 5 th time slot in the periodic time interval is obtained according to the pilot symbol in the DPCCH sub-frame time slot synchronous with the time slot.
103. And determining the power control command word of the a-th time slot according to the signal energy estimated value.
In each embodiment of the present invention, the power control command word of a certain slot refers to a command word for controlling the ue to adjust the transmission power of a symbol of a slot next to the slot.
104. And transmitting the power control command word of the a-th time slot to the user equipment.
In the embodiment of the invention, the power control command word of the first a-1 time slots in the period sent to the user equipment by the power control equipment is the preset power control command word, and the power control command word of the a-th time slot in the period sent to the user equipment is obtained according to the signal energy estimated value in the period, so that the power control equipment is not required to calculate the power control command word aiming at each time slot, thereby enabling the user equipment to adjust the sending power of the next time slot in time and reducing the time delay for sending the next time slot symbol.
Referring to fig. 2, another power control method is provided in the embodiment of the present invention, where a is equal to 3 as an example, and the method specifically includes:
201. the power control equipment receives the symbol of the 1 st time slot of the E-DPCCH sub-frame and sends a preset power control command word of the 1 st time slot to the user equipment.
202. And the power control equipment receives the symbol of the 2 nd time slot of the E-DPCCH sub-frame and sends a preset power control command word of the 2 nd time slot to the user equipment.
Wherein, one of the preset 1 st time slot power control command word and the preset 2 nd time slot power control command word indicates the user equipment to reduce the transmission power, and the other power control command word indicates the user equipment to increase the transmission power, so that the transmission power of the user equipment after being adjusted according to the 2 nd time slot power control command word is the same as the transmission power before being adjusted according to the 1 st time slot power control command word.
203. The power control apparatus calculates the E-TFCI based on the received 2N + M-1 symbols of the E-DPCCH subframe when the 2N + M-1 symbols of the E-DPCCH subframe are received.
Where N is the number of symbols per slot of the E-DPCCH sub-frame, typically N equals 10; m is the number of pilot symbols transmitted per slot of the DPCCH subframe, and in general, M may be equal to 4, 5 or 6. The power control apparatus starts to calculate the E-TFCI at the 2N + M-1 th symbol, and can finish calculating the E-TFCI at the 2N + M th symbol.
204. And when the power control equipment receives the 2N + M symbols of the E-DPCCH sub-frame, determining the pilot symbol of the 3 rd time slot of the E-DPCCH sub-frame according to the pilot symbol in the DPCCH sub-frame time slot synchronous with the 3 rd time slot of the E-DPCCH sub-frame.
Because the pilot symbols of each time slot of the DPCCH sub-frame are the first M symbols of each time slot of the DPCCH sub-frame, the pilot symbols in the DPCCH sub-frame time slot synchronous with the 3 rd time slot of the E-DPCCH sub-frame can be analyzed when the 2N + M symbols of the E-DPCCH sub-frame are right, and the pilot symbols of the 3 rd time slot of the E-DPCCH sub-frame can be obtained according to the pilot symbols.
205. And the power control equipment acquires a signal energy offset value corresponding to the E-TFCI. Wherein the signal energy offset value represents an offset of a transmission power of the E-DPCCH sub-frame with respect to a transmission power of the DPCCH sub-frame.
Specifically, the power control device obtains the power offset value corresponding to the E-TFCI according to the corresponding relationship between the E-TFCI and the power offset value, and calculates the square of the power offset value to obtain the signal energy offset value corresponding to the E-TFCI. The power offset value is an offset which represents the amplitude of the transmission signal of the E-DPCCH sub-frame relative to the amplitude of the transmission signal of the DPCCH sub-frame, namely the ratio of the amplitude of the transmission signal of the E-DPCCH sub-frame to the amplitude of the transmission signal of the DPCCH sub-frame, and the power offset value can be a preset value. Or, the power control device presets the corresponding relation between the E-TFCI and the signal energy offset value, and in the step, the power control device obtains the signal energy offset value corresponding to the E-TFCI according to the corresponding relation between the E-TFCI and the signal energy offset value.
206. And the power control equipment determines a signal energy estimated value before the 3 rd time slot of the E-DPCCH sub-frame according to the pilot symbol of the 3 rd time slot of the E-DPCCH sub-frame and the received symbol of the 3 rd time slot of the E-DPCCH sub-frame, wherein the signal energy estimated value before the 3 rd time slot of the E-DPCCH sub-frame is the difference of the biased signal energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame and the noise energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame.
Wherein, the symbol of the 3 rd slot of the E-DPCCH subframe received in this step may be the first M symbols of the 3 rd slot.
Specifically, the biased signal energy estimation value and the noise energy estimation value of the 3 rd time slot of the E-DPCCH sub-frame can be determined according to the pilot symbol of the 3 rd time slot of the E-DPCCH sub-frame and the received symbol of the 3 rd time slot of the E-DPCCH sub-frame, and the noise energy estimation value is subtracted from the biased signal energy estimation value to obtain the signal energy estimation value before the 3 rd time slot of the E-DPCCH sub-frame is converted.
207. And the power control equipment divides the signal energy estimated value before the 3 rd time slot of the E-DPCCH sub-frame is converted by the signal energy offset value to obtain the signal energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame.
Dividing the signal energy estimated value before the 3 rd time slot of the E-DPCCH sub-frame by the signal energy offset value is equivalent to converting the signal energy estimated value before the 3 rd time slot of the E-DPCCH sub-frame to the energy level of the DPCCH sub-frame so as to determine the power control command word in the subsequent step.
208. The power control equipment determines the estimated value of the signal-to-interference ratio characterization parameter of the 3 rd time slot of the E-DPCCH sub-frame according to the estimated value of the signal energy of the 3 rd time slot of the E-DPCCH sub-frame and the estimated value of the noise energy of the 3 rd time slot of the E-DPCCH sub-frame; and generating a power control command word of the 3 rd time slot according to the estimated value and the threshold of the signal-to-interference ratio characterization parameter.
The Signal to Interference Ratio characterization parameter may be a Signal to Interference Ratio (SIR) or a Signal to Interference plus Noise Ratio (SINR), and the implementation of the present invention is not affected. Optionally, the estimated value of the SIR characterizing parameter may be filtered to obtain a true value of the SIR characterizing parameter, the true value of the SIR characterizing parameter is then compared with the threshold, and the power control command word of the 3 rd time slot is generated according to the comparison result, so that the true SIR value compared with the threshold is relatively stable without large deviation. Specifically, when the SIR characterizing parameter is SIR, the threshold is a predetermined SIR target value, and when the true SIR value is greater than the threshold, the generated power control command word of the 3 rd slot instructs the ue to decrease the transmission power; when the true SIR value is less than or equal to the threshold, the generated power control command word for the 3 rd slot instructs the user equipment to increase the transmission power.
Specifically, the base station may filter the estimated value of the sir characterization parameter by using the following formula to obtain the true value of the sir characterization parameter:
y(n)＝x*(1-b)+y(n-1)*b
where b is a filter coefficient and b is an empirical value obtained empirically, e.g., b may be 0.6, 0.9, etc. n is 1, 2 or 3, and x is an estimated value of a signal-to-interference ratio characterization parameter of the nth time slot of the E-DPCCH sub-frame; y (n-1) is the real value of the signal-to-interference ratio characterization parameter of the nth time slot of the E-DPCCH sub-frame, and y (n) is the real value of the signal-to-interference ratio characterization parameter of the nth time slot of the E-DPCCH sub-frame; wherein x and y (n-1) are real values of the signal-to-interference ratio characterization parameter of the 3 rd slot of the E-DPCCH sub-frame before the E-DPCCH sub-frame received by the power control device when n is 1 or 2.
In the embodiment of the invention, when the 2N + M-1 symbol is detected, the E-TFCI is calculated according to the received symbol of the E-DPCCH subframe; and when the number of the 2N + M symbols is larger than the preset value, determining a signal energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame according to the pilot symbol of the 3 rd time slot of the E-DPCCH sub-frame and the received symbol of the 3 rd time slot of the E-DPCCH sub-frame, and further generating a power control command word. Therefore, the power control equipment can start to execute the correlation calculation for generating the power control command word when the symbol of the 3 rd time slot of the E-DPCCH subframe is not completely received, and send the generated power control command word to the user equipment, so that the user equipment can adjust the sending power of the next time slot in time, and the time delay for sending the symbol of the next time slot is saved.
In order to make the technical solutions provided by the embodiments of the present invention more clearly understood, the following embodiments describe the above technical solutions in detail:
301. and the base station receives the symbol of the 1 st time slot of the E-DPCCH sub-frame, sends TCP1 which is 0 to the user equipment, and enables the user equipment to adjust the sending power of the E-DPCCH sub-frame sent in the next time slot.
Wherein, TCP1 ═ 0 is used to instruct the ue to reduce the transmit power, and after receiving TCP1, the ue reduces the transmit power by Δ TPC, and transmits the symbol of the 2 nd slot of the E-DPCCH subframe by using the reduced transmit power, where Δ TPC is a predetermined power step size, and Δ TPC may be 1dB, or other preset values.
302. And the base station receives the symbol of the 2 nd time slot of the E-DPCCH sub-frame, sends the TCP2 to the user equipment as 1, and enables the user equipment to adjust the sending power of the E-DPCCH sub-frame sent in the next time slot.
Wherein, TCP2 ═ 1 is used to instruct the ue to increase the transmit power, and upon receiving TCP2, the ue increases the transmit power by Δ TPC and transmits the symbol of the 3 rd slot of the E-DPCCH subframe with the increased transmit power.
It should be noted that, the ue decreases the transmission power by Δ TPC after receiving TCP1, and increases the transmission power by Δ TPC after receiving TCP2, since the magnitude of the decrease of the transmission power is the same as the magnitude of the increase, it is equivalent to that the transmission power is not effectively adjusted.
Optionally, in step 301, the TCP1 sent by the base station to the ue may be 1, and after receiving the TCP1, the ue increases the transmit power by Δ TPC and sends a symbol of the 2 nd slot of the E-DPCCH subframe by using the increased transmit power; in step 302, the TCP2 sent by the bs to the ue is 0, the ue receives the TCP2 and then reduces the transmit power by Δ TPC, and sends the symbol of the 3 rd slot of the E-DPCCH subframe with the reduced transmit power, which is equivalent to that the transmit power is not effectively adjusted because the increased amplitude and the decreased amplitude of the transmit power are the same.
303. When the base station receives the 4 th symbol of the 3 rd time slot of the E-DPCCH subframe, the first 24 symbols of the E-DPCCH subframe are utilized to analyze the E-TFCI, and the power offset value corresponding to the analyzed E-TFCI is determined according to the corresponding relation between the E-TFCI preset in the base station and the power offset value.
The E-DPCCH subframe comprises 10 bits of information, and the 10 bits of information comprise three parts:
1. E-TFCI: an E-DCH transport format combination indicator, 7 bits long, for indicating a transport format in an E-DCH Dedicated Physical Data Channel (E-DPDCH) Channel. In essence, the E-TFCI informs the bs of the transport block size in the E-DPDCH, and based on this information the bs can deduce how many E-DPDCH channels are transmitted in parallel, what spreading factor is used, etc.
2. RSN: and the retransmission sequence number is 2 bits long and is used for informing the sequence number of the transmission block currently sent on the E-DPDCH.
3. Happy bit: only 1bit to indicate whether the UE is satisfied with the current data rate or whether higher power needs to be allocated.
10 bits of information of the E-DPCCH subframe are modulated by Binary Phase Shift Keying (BPSK) of a transmission channel to form 30 symbols, and the embodiment of the present invention starts analyzing the E-TFCI after receiving the 24 th symbol.
304. When the base station receives the 5 th symbol of the DPCCH time slot synchronous with the 3 rd time slot of the E-DPCCH, the Pilot symbol Pilot of the DPCCH time slot (namely the first 5 symbols of the DPCCH time slot) is utilized to determine the Pilot symbol of the 3 rd time slot of the E-DPCCH sub-frame, the biased signal energy estimated value and the noise energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame are calculated according to the Pilot symbol of the 3 rd time slot of the E-DPCCH sub-frame and the received symbol in the 3 rd time slot of the E-DPCCH sub-frame, and the noise energy estimated value is subtracted from the biased signal energy estimated value to obtain the signal energy estimated value before the 3 rd time slot of the E-DPC.
The protocol specifies that the pilot symbols in each slot of the DPCCH sub-frame are the first few symbols of the slot, and in the embodiment, the first 5 symbols of each slot of the DPCCH sub-frame are assumed to be pilot symbols, and the step calculates the pilot symbols of the 3 rd slot of the E-DPCCH sub-frame by using the pilot symbols of the slot immediately after receiving the pilot symbols of the slot of the DPCCH sub-frame synchronized with the 3 rd slot of the E-DPCCH. The process for calculating the pilot symbol of the 3 rd time slot of the E-DPCCH sub-frame comprises the following steps: and carrying out conjugate multiplication processing on pilot symbols of time slots of the DPCCH sub-frame synchronized with the 3 rd time slot of the E-DPCCH to obtain channel response, correcting the deviation of each radial symbol of the 3 rd time slot of the E-DPCCH sub-frame by utilizing the channel response to obtain a symbol-level signal, and carrying out hard decision on the obtained symbol-level signal to obtain the E-DPCCH pilot symbols.
Wherein the step can determine the noise energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame by using the following formulas (1) and (2):
wherein, i is 0, 1, 2. y isE-DPCCH，i，jJ-th symbol representing ith path in one slot of E-DPCCH sub-frame, M represents the number of pilots in each slot, and the embodiment assumes that M is 5; a iskAnd ajIs a pilot symbol of the 3 rd slot of the E-DPCCH subframe.
Wherein,
representing the noise energy estimate for slot 3 of the E-DPCCH sub-frame.
Wherein, the step can obtain the signal energy estimated value E before the 3 rd time slot of the E-DPCCH sub-frame is converted by using the following formula (3)s，E-DPCCH：
The substraction in the formula (3) is the biased signal energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame, and the substraction is the noise energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame.
305. The base station divides the estimated signal energy value before the 3 rd time slot of the E-DPCCH sub-frame obtained in the step 304 by the square of the power offset value determined in the step 303 to obtain the estimated signal energy value of the 3 rd time slot of the E-DPCCH sub-frame after the conversion.
Specifically, a signal energy estimation value E 'of the 3 rd slot of the E-DPCCH sub-frame is determined by using the following formula (4)'s，E-DPCCH：
Where Betaec represents the power bias.
306. And the base station determines the SIR value corresponding to the 3 rd time slot of the E-DPCCH sub-frame by utilizing the signal energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame and the noise estimated value of the 3 rd time slot of the E-DPCCH sub-frame.
Specifically, the SIR value corresponding to the 3 rd slot of the E-DPCCH subframe is determined by using the following formula (5):
307. the base station compares the determined SIR value with a threshold value and generates TCP3 based on the comparison result.
Wherein the threshold is a target SIR value preset by the base station. When the determined SIR value is greater than the threshold, then TCP3 is 0, where TCP3 is 0 for instructing the user equipment to decrease the transmission power; when the determined SIR value is less than or equal to the threshold, TCP3 is 1, where TCP3 is 1 for instructing the user equipment to increase the transmission power.
308. The base station transmits TCP3 to the user equipment, which causes the user equipment to adjust the transmission power of the next slot according to TCP 3.
In the embodiment of the invention, aiming at the E-DPCCH subframe, the transmitted TCP1 and TCP2 are configured in advance, and the transmission power after the user equipment is adjusted according to the TCP2 is the same as the transmission power before the user equipment is adjusted according to the TCP1, so that the transmission power of the user equipment is not adjusted, an effective power control command word TCP3 is generated only in the 3 rd time slot and is transmitted to the user equipment, and the power control method in the boosting mode can effectively control the transmission power of the user equipment. Furthermore, since TCP1 and TCP2 are pre-configured and do not need to be generated temporarily, the user equipment can adjust the transmission power of the next slot in time, and the delay of transmitting the next slot symbol is saved.
Referring to fig. 4, an embodiment of the present invention provides a power control device, where the power control device may be a base station or other access devices, and the power control device includes:
a storing unit 10, configured to store power control command words of first a-1 time slots in a preset cycle period; wherein the periodic time period comprises at least a time slots, and a is greater than or equal to 3;
a signal energy estimation value obtaining unit 20, configured to obtain a signal energy estimation value of an a-th time slot;
a power control command word determining unit 30, configured to determine a power control command word of an a-th timeslot according to the signal energy estimation value;
a sending unit 40, configured to send the power control command word of the first a-1 time slots in the period to the user equipment, so that the sending power of the user equipment after being adjusted according to the power control command word of the first a-1 time slot is the same as the sending power of the user equipment before being adjusted according to the power control command word of the 1 st time slot; and transmitting the power control command word of the a-th time slot to the user equipment.
Where a is equal to 3, or 5, or 7, etc., and when a is equal to 3, the a-th slot is the 3 rd slot of the E-DPCCH subframe, the signal energy estimation value obtaining unit 20 may specifically include:
an E-TFCI determining unit 21, configured to determine an E-TFCI according to a symbol of a 1 st slot, a symbol of a 2 nd slot, and a partial symbol of a 3 rd slot of an E-DPCCH subframe sent by a user equipment after receiving the partial symbol of the 3 rd slot of the E-DPCCH subframe;
a pilot symbol determining unit 22, configured to determine a pilot symbol of the 3 rd slot of the E-DPCCH subframe according to a pilot symbol in the DPCCH subframe slot synchronized with the 3 rd slot of the E-DPCCH subframe;
and the signal energy estimated value determining unit 23 is configured to determine a signal energy estimated value of the 3 rd time slot of the E-DPCCH subframe according to the E-TFCI and the pilot symbol of the 3 rd time slot of the E-DPCCH subframe.
In an embodiment, the signal energy estimation value determining unit 23 specifically includes:
a first obtaining unit 231, configured to obtain a signal energy offset value corresponding to the E-TFCI; the signal energy offset value represents an offset of a transmit power of the E-DPCCH subframe relative to a transmit power of a dedicated physical data channel (DPCCH) subframe;
a second obtaining unit 232, configured to determine a biased signal energy estimation value of the 3 rd slot of the E-DPCCH subframe and a noise energy estimation value of the 3 rd slot of the E-DPCCH subframe according to a pilot symbol of the 3 rd slot of the E-DPCCH subframe and a received symbol of the 3 rd slot; and obtaining the signal energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame according to the difference between the biased signal energy estimated value and the noise energy estimated value and the signal energy bias value.
Specifically, the relevant description of the lengths of the E-DPCCH subframe, the DPCCH subframe and the like is described in the method embodiment, and is not repeated herein.
The E-TFCI determining unit 21 is specifically configured to determine, when a 2N + M-1 symbol of an E-DPCCH subframe is received, an E-TFCI according to a symbol of a 1 st slot, a symbol of a 2 nd slot and a partial symbol of a 3 rd slot of the E-DPCCH subframe, where the symbol of the 1 st slot, the symbol of the 2 nd slot and the partial symbol of the 3 rd slot of the E-DPCCH subframe are the first 2N + M-1 symbols of the E-DPCCH subframe, where N is a number of symbols of each slot of the E-DPCCH subframe, and M is a number of pilot symbols transmitted in each slot of the DPCCH subframe, where a specific manner of determining the E-TFCI according to the received symbol of the E-DPCCH subframe is described in detail in the method embodiments. And the pilot symbol determining unit 23 is specifically configured to determine, when 2N + M symbols of the E-DPCCH subframe are received, a pilot symbol of a 3 rd slot of the E-DPCCH subframe according to a pilot symbol in a DPCCH subframe slot synchronized with the 3 rd slot of the E-DPCCH subframe, where a specific manner of determining the pilot symbol of the 3 rd slot of the E-DPCCH subframe is described in detail in the method embodiment.
The power control command word determination unit 30 specifically includes:
a signal-to-interference ratio characteristic value determining unit 31, configured to determine an estimated value of a signal-to-interference ratio characteristic parameter of a 3 rd time slot of the E-DPCCH subframe according to the estimated value of the signal energy and the estimated value of the noise energy of the 3 rd time slot of the E-DPCCH subframe; the SIR characterizing parameter may be SIR or SINR. Specifically, the estimated value of the signal-to-interference ratio characterization parameter of the 3 rd time slot of the E-DPCCH sub-frame can be determined according to the estimated value of the signal energy of the 3 rd time slot of the E-DPCCH sub-frame and the estimated value of the noise energy of the 3 rd time slot of the E-DPCCH sub-frame.
A filtering unit 32, configured to determine a true value of the sir characterization parameter at the 3 rd slot of the E-DPCCH subframe by using the following formula and the estimated value of the sir characterization parameter;
y(n)＝x*(1-b)+y(n-1)*b
wherein b is a filter coefficient, b is an empirical value obtained empirically, and b may be 0.6, 0.9, etc.; n is 1, 2 or 3, and x is an estimated value of a signal-to-interference ratio characterization parameter of the nth time slot of the E-DPCCH sub-frame; y (n-1) is the real value of the signal-to-interference ratio characterization parameter of the nth time slot of the E-DPCCH sub-frame, and y (n) is the real value of the signal-to-interference ratio characterization parameter of the nth time slot of the E-DPCCH sub-frame; when n is 1 or 2, x and y (n-1) are real values of signal-to-interference ratio characterization parameters of a 3 rd time slot of an E-DPCCH subframe before the E-DPCCH subframe received by the base station;
and a comparing unit 33, configured to compare the actual value of the signal-to-interference ratio characterization parameter of the 3 rd time slot of the E-DPCCH subframe with a threshold, and generate a power control command word of the 3 rd time slot of the E-DPCCH subframe.
The power control command word of the first a-1 time slots in the period sent by the power control device to the user device is the preset power control command word, so that the power control device does not need to calculate the power control command word aiming at each time slot, thereby enabling the user device to adjust the sending power of the next time slot in time and reducing the time delay for sending the symbol of the next time slot. Further, the power control device calculates E-TFCI according to the symbol of the received E-DPCCH sub-frame when the 2N + M-1 symbol is in the 2 nd symbol; and when the number of the symbols is 2N + M, determining a biased signal energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame according to the pilot symbol of the 3 rd time slot of the E-DPCCH sub-frame and the received symbol of the 3 rd time slot of the E-DPCCH sub-frame, and further generating a power control command word. Thus, the power control device can start to execute the correlation calculation for generating the power control command word when the symbol of the 3 rd time slot of the E-DPCCH sub-frame is not completely received, and the time delay for sending the next time slot symbol can be further saved.
Referring to fig. 5, an embodiment of the present invention provides a network system, which includes a user equipment 501 and a power control device 502, wherein the structure and function of the power control device are the same as those described in the above description of the embodiment shown in fig. 4, and are not described again here.
And the user equipment is used for receiving the power control command word sent by the power control equipment and adjusting the sending power according to the received power control command word.
Those skilled in the art will appreciate that all or part of the steps in the method for implementing the above embodiments may be implemented by hardware that is instructed to do so by a program, and the program may be stored in a computer-readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like.
The power control method and the power control device provided by the embodiment of the present invention are described in detail above, and a specific example is applied in the text to explain the principle and the embodiment of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (13)
1. A method of power control, comprising:
sending power control command words of the first a-1 time slots in a preset period to user equipment, and enabling the sending power of the user equipment after being adjusted according to the power control command words of the first a-1 time slots to be the same as the sending power of the user equipment before being adjusted according to the power control command words of the 1 st time slot; wherein the periodic time period comprises at least a time slots, and a is greater than or equal to 3;
acquiring a signal energy estimated value of the a-th time slot;
determining a power control command word of the a-th time slot according to the signal energy estimated value;
and transmitting the power control command word of the a-th time slot to the user equipment.
2. The method of claim 1,
said a is equal to 3; the a-th time slot is the 3 rd time slot of the E-DPCCH subframe;
the obtaining of the estimated value of the signal energy of the a-th time slot includes:
after receiving a part of symbols of a 3 rd time slot of an enhanced dedicated physical data channel (E-DPCCH) subframe sent by user equipment, determining a transport format combination indicator (E-TFCI) according to the symbols of a 1 st time slot, the symbols of a 2 nd time slot and the part of symbols of the 3 rd time slot of the E-DPCCH subframe;
determining a pilot symbol of the 3 rd time slot of the E-DPCCH sub-frame according to the pilot symbol in the 3 rd time slot of the DPCCH sub-frame synchronous with the E-DPCCH sub-frame;
and determining a signal energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame according to the E-TFCI and the pilot symbol of the 3 rd time slot of the E-DPCCH sub-frame.
3. The method of claim 2,
after receiving a part of symbols of a 3 rd time slot of an E-DPCCH subframe sent by user equipment, determining an E-TFCI according to the symbols of a 1 st time slot, the symbols of a 2 nd time slot and the part of symbols of the 3 rd time slot of the E-DPCCH subframe, including:
and when receiving the 2N + M-1 symbol of the E-DPCCH subframe, determining the E-TFCI according to the received 2N + M-1 symbols of the E-DPCCH subframe, wherein N is the number of symbols of each time slot of the E-DPCCH subframe, and M is the number of pilot symbols transmitted by each time slot of the DPCCH subframe.
4. The method of claim 3,
the determining the pilot symbol of the 3 rd time slot of the E-DPCCH sub-frame according to the pilot symbol in the DPCCH sub-frame time slot synchronous with the 3 rd time slot of the E-DPCCH sub-frame comprises the following steps:
and when the 2N + M symbols of the E-DPCCH sub-frame are received, determining the pilot symbol of the 3 rd time slot of the E-DPCCH sub-frame according to the pilot symbol in the DPCCH sub-frame time slot synchronous with the 3 rd time slot of the E-DPCCH sub-frame.
5. The method of claim 4,
the determining the signal energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame according to the E-TFCI and the pilot symbol of the 3 rd time slot of the E-DPCCH sub-frame comprises the following steps:
acquiring a signal energy offset value corresponding to the E-TFCI; the signal energy offset value represents an offset of a transmit power of the E-DPCCH subframe relative to a transmit power of a dedicated physical data channel (DPCCH) subframe;
determining a biased signal energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame and a noise energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame according to a pilot symbol of the 3 rd time slot of the E-DPCCH sub-frame and a received symbol of the 3 rd time slot;
and obtaining the signal energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame according to the difference between the biased signal energy estimated value and the noise energy estimated value and the signal energy bias value.
6. The method of claim 2,
the determining the power control command word of the a-th time slot according to the signal energy estimated value comprises:
determining an estimated value of a signal-to-interference ratio characterization parameter of the 3 rd time slot of the E-DPCCH sub-frame according to the estimated value of the signal energy and the estimated value of the noise energy of the 3 rd time slot of the E-DPCCH sub-frame;
determining a real value of the signal-to-interference ratio characterization parameter of the 3 rd time slot of the E-DPCCH subframe by using the following formula and the estimated value of the signal-to-interference ratio characterization parameter;
y(n)＝x*(1-b)+y(n-1)*b
wherein b is a filter coefficient; n is 1, 2 or 3, and x is an estimated value of a signal-to-interference ratio characterization parameter of the nth time slot of the E-DPCCH sub-frame; y (n-1) is the real value of the signal-to-interference ratio characterization parameter of the nth time slot of the E-DPCCH sub-frame, and y (n) is the real value of the signal-to-interference ratio characterization parameter of the nth time slot of the E-DPCCH sub-frame; when n is 1 or 2, x and y (n-1) are real values of a signal-to-interference ratio characterization parameter of a 3 rd time slot of an E-DPCCH subframe before the E-DPCCH subframe received by a base station;
and comparing the real value of the signal to interference ratio characterization parameter of the 3 rd time slot of the E-DPCCH sub-frame with a threshold value, and generating a power control command word of the 3 rd time slot of the E-DPCCH sub-frame.
7. A power control apparatus, comprising:
the saving unit is used for saving the power control command words of the first a-1 time slots in the preset cycle period; wherein the periodic time period comprises at least a time slots, and a is greater than or equal to 3;
a signal energy estimated value obtaining unit, configured to obtain a signal energy estimated value of an a-th time slot;
a power control command word determining unit, configured to determine a power control command word of an a-th time slot according to the signal energy estimation value;
a sending unit, configured to send the power control command word of the first a-1 time slots in the period to the user equipment, so that the sending power of the user equipment after being adjusted according to the power control command word of the first a-1 time slot is the same as the sending power of the user equipment before being adjusted according to the power control command word of the 1 st time slot; and transmitting the power control command word of the a-th time slot to the user equipment.
8. The power control apparatus of claim 7,
said a is equal to 3; the a-th time slot is the 3 rd time slot of the E-DPCCH subframe;
the signal energy estimated value acquisition unit includes:
an E-TFCI determining unit, configured to determine a transport format combination indicator E-TFCI according to a symbol of a 1 st slot, a symbol of a 2 nd slot, and a partial symbol of a 3 rd slot of an E-DPCCH subframe after receiving the partial symbol of the 3 rd slot of the E-DPCCH subframe sent by a user equipment;
a pilot symbol determining unit, which is used for determining the pilot symbol of the 3 rd time slot of the E-DPCCH sub-frame according to the pilot symbol in the DPCCH sub-frame time slot which is synchronous with the 3 rd time slot of the E-DPCCH sub-frame;
and the signal energy estimated value determining unit is used for determining the signal energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame according to the E-TFCI and the pilot symbol of the 3 rd time slot of the E-DPCCH sub-frame.
9. The power control apparatus of claim 8,
the E-TFCI determining unit is specifically configured to determine the E-TFCI according to the received 2N + M-1 symbols of the E-DPCCH sub-frame when the 2N + M-1 symbols of the E-DPCCH sub-frame are received, where N is the number of symbols of each slot of the E-DPCCH sub-frame, and M is the number of pilot symbols transmitted by each slot of the DPCCH sub-frame.
10. The power control apparatus according to claim 9,
and the pilot symbol determining unit is used for determining the pilot symbol of the 3 rd time slot of the E-DPCCH sub-frame according to the pilot symbol in the DPCCH sub-frame time slot synchronous with the 3 rd time slot of the E-DPCCH sub-frame when the 2N + M symbols of the E-DPCCH sub-frame are received.
11. The power control apparatus according to claim 10,
the signal energy estimation value determination unit includes:
a first obtaining unit, configured to obtain a signal energy offset value corresponding to the E-TFCI; the signal energy offset value represents an offset of a transmit power of the E-DPCCH subframe relative to a transmit power of a dedicated physical data channel (DPCCH) subframe;
a second obtaining unit, configured to determine a biased signal energy estimation value of a 3 rd slot of the E-DPCCH subframe and a noise energy estimation value of the 3 rd slot of the E-DPCCH subframe according to a pilot symbol of the 3 rd slot of the E-DPCCH subframe and a received symbol of the 3 rd slot; and obtaining the signal energy estimated value of the 3 rd time slot of the E-DPCCH sub-frame according to the difference between the biased signal energy estimated value and the noise energy estimated value and the signal energy bias value.
12. The power control apparatus of claim 8,
the power control command word determining unit includes:
a signal-to-interference ratio characteristic value determining unit, configured to determine an estimated value of a signal-to-interference ratio characteristic parameter of a 3 rd time slot of the E-DPCCH subframe according to the signal energy estimated value and a noise energy estimated value of the 3 rd time slot of the E-DPCCH subframe;
the filtering unit is used for determining the true value of the signal-to-interference ratio characterization parameter of the 3 rd time slot of the E-DPCCH subframe by using the following formula and the estimation value of the signal-to-interference ratio characterization parameter;
y(n)＝x*(1-b)+y(n-1)*b
b is a filter coefficient, n is 1, 2 or 3, and x is an estimated value of a signal-to-interference ratio characterization parameter of the nth time slot of the E-DPCCH sub-frame; y (n-1) is the real value of the signal-to-interference ratio characterization parameter of the nth time slot of the E-DPCCH sub-frame, and y (n) is the real value of the signal-to-interference ratio characterization parameter of the nth time slot of the E-DPCCH sub-frame; when n is 1 or 2, x and y (n-1) are real values of signal-to-interference ratio characterization parameters of a 3 rd time slot of an E-DPCCH subframe before the E-DPCCH subframe received by the base station;
and the comparison unit is used for comparing the real value of the signal to interference ratio characterization parameter of the 3 rd time slot of the E-DPCCH sub-frame with a threshold value and generating a power control command word of the 3 rd time slot of the E-DPCCH sub-frame.
13. A system, comprising: the power control device and user equipment of any of claims 7-12,
and the user equipment is used for receiving the power control command word sent by the power control equipment and adjusting the sending power according to the received power control command word.
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| CN101237260A (en) * | 2007-02-02 | 2008-08-06 | 中兴通讯股份有限公司 | Uplink power control device and method |
| CN101309096A (en) * | 2007-05-16 | 2008-11-19 | 展讯通信（上海）有限公司 | Power control command transmitting/receiving method and apparatus |
| CN101741436A (en) * | 2008-11-12 | 2010-06-16 | 大唐移动通信设备有限公司 | Power control method and equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101237260A (en) * | 2007-02-02 | 2008-08-06 | 中兴通讯股份有限公司 | Uplink power control device and method |
| CN101309096A (en) * | 2007-05-16 | 2008-11-19 | 展讯通信（上海）有限公司 | Power control command transmitting/receiving method and apparatus |
| CN101741436A (en) * | 2008-11-12 | 2010-06-16 | 大唐移动通信设备有限公司 | Power control method and equipment |
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