CN100365950C - A method for acquiring downlink transmitting power of base station system - Google Patents
A method for acquiring downlink transmitting power of base station system Download PDFInfo
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Abstract
The present invention discloses a method for obtaining the downlink transmitting power of a base station system. The method comprises: 1) the base station receives uplink information sent by a user terminal and demodulates a downlink TPC command included in the uplink information to obtain the command word of the downlink TPC command, evaluates the uplink receiving quality to obtain the uplink TPC command word, and simultaneously, generates a downlink transmitting power adjustment quantity according to the downlink TPC command word and the uplink TPC command word; 2) the base station obtains the downlink transmitting power adjustment quantity according to a downlink power balance algorithm, adds the downlink transmitting power adjustment quantity obtained by the downlink power balance algorithm, the downlink transmitting power adjustment quantity generated by step 1 and the downlink transmitting power of a prior time slot together to obtain the downlink transmitting power of the current time slot, and the downlink transmitting power of the base station is controlled according to the downlink transmitting power of the current time slot. By using the system, when the user terminal is positioned in a soft switch area, the user terminal can save transmission power and increase the stability and the uplink capacity and the downlink capacity of the base station system.
Description
Technical Field
The present invention relates to power control technology, and is especially method of acquiring downlink transmitting power in Wideband Code Division Multiple Access (WCDMA) base station system.
Background
With the rise of third generation communication network technology, WCDMA technology is also continuously developing. The power control method is one of the core technologies of the physical layer of the WCDMA, and can effectively overcome the near-far effect, so that the WCDMA technology is applied; soft handover is also one of the main functions of WCDMA systems, which not only achieves uninterrupted handover, but also brings system gain.
The current 3G standards-making organization (3 GPP) has disclosed a 3GPP protocol in 3GPP TS 25.214 530 Physical Layer Procedures (FDD) (Release 5), which discloses a WCDMA base station system power control method. As shown in fig. 1, in a wireless network, a user terminal (UE) may be connected to multiple Radio Links (RLs), such as RL1 and RL2, each RL corresponding to a cell and a set of network-side transmitters and receivers, and the network-side of each RL being a base station system. In the method, the UE side and the network side of each RL measure the reception quality in real time and reduce or increase the transmitter power through a fed-back physical layer Transmit Power Control (TPC) command to maintain the reception quality at a desired level.
The method comprises an uplink inner loop power control process and a downlink inner loop power control process, wherein the uplink refers to from a UE side to a network side, and the downlink refers to from the network side to the UE side. The uplink inner loop power control process is shown by a dotted arrow in fig. 1, and the process includes: a1, a UE side transmitter sends uplink air interface information 101 to each RL network side receiver;
a2, each RL network side receiver evaluates an uplink signal-to-interference ratio (SIR), generates an uplink TPC command according to the SIR and sends the generated uplink TPC command to a RL network side transmitter;
a3, each RL network side transmitter sends downlink air interface information 102 to a UE side receiver, wherein the downlink air interface information comprises an uplink TPC command and air interface data streams;
a4, the UE side receiver receives the downlink air interface information 102, demodulates the reserved uplink TPC commands of each RL, combines each uplink TPC command to generate an uplink TPC command, and sends the uplink TPC command to the UE side transmitter.
and a5, the UE side transmitter adjusts the uplink transmission power according to the received uplink TPC command.
The downlink inner loop power control is shown by a solid line in fig. 1, and specifically includes:
b1, a network side transmitter of each RL transmits downlink air interface information 102 to a UE side receiver, wherein the downlink air interface information comprises downlink air interface data and a downlink TPC command;
b2, the UE side receiver evaluates the downlink SIR of each RL, combines the downlink SIR to generate a downlink TPC command, and sends the generated downlink TPC command to the UE side transmitter;
b3, the UE side transmitter transmits the received downlink TPC command to each receiver of the network side;
b4, each RL network side receiver demodulates the downlink TPC command and sends the downlink TPC command to the transmitter corresponding to the RL;
b5, each RL transmitter on the network side adjusts the downlink transmitting power according to the received downlink TPC command.
In the 3GPP method, there are two modes for performing downlink power control, which are downlink power control mode 0 and downlink power control mode 1. For the downlink power control mode 0, the network side transmitter adjusts the downlink transmission power once per time slot; for the downlink power control mode 1, the network side transmitter adjusts the downlink transmission power every three time slots. The network side transmitter obtains downlink transmission power according to the following formula (1):
P(k)＝P(k-1)+Ptpc(k)+Pbal(k) (1)
wherein: p (k) is the downlink transmission power of the kth time slot, ptp c (k) is the power control adjustment amount required by the downlink TPC of the kth time slot, and Pbal (k) is the downlink transmission power adjustment amount of the kth time slot calculated by using the downlink power balance algorithm. The Ptpc (k) is obtained according to the following formula (2):
in equation (2), TPCdl (k) is the command word of the kth slot downlink TPC command, "1" indicates power up, and "0" indicates power down. Delta of TPC For the power control step, the adjustment amount of power is shown as + delta TPC Represents a literPower-delta higher by a certain power control step length TPC The power of a certain power control step length is reduced, and in the 3GPP protocol, four values of the power control step length are specified, wherein one value is the power control step length of a unit, the value is 0.5dB, and the other three values are the power control step length of the unitThe integral multiple of the step length can be selected as the adjustment amount of the power according to the specific situation in the specific application. The value of the power control step here is one unit, namely 0.5dB.
The Pbal (k) is obtained according to the following formula (3):
∑P bal ＝(1-r)(P ref +P P-CPICH -P init ) (3)
in equation (3), Σ P bal Is the total adjustment amount of the downlink power balance algorithm in an adjustment period, wherein P ref For reference power offset, P P-CPICH Is the pilot power offset, P, of the own cell init The downlink transmit power of the last slot in a power adjustment period on the current RL is adjusted by r. According to the above-mentioned sigma P bal And the network side can calculate the adjustment amount Pbal (k) of each time slot in the adjustment period.
The above method is a relatively direct processing procedure, and it can be seen from fig. 1 that there is no cross point between the uplink inner-loop power control loop and the downlink inner-loop power control loop, so that the uplink inner-loop power control and the downlink inner-loop power control are independent from each other. The uplink inner loop power control only considers the uplink receiving quality, and the downlink inner loop power control only considers the downlink receiving quality.
In the case of a single RL, i.e. the UE is in a cell, the sender can respond to the feedback TPC command of the receiver in time because the network side only has a group of transmitters and receivers, thereby quickly adjusting the sending power, and the convergence of the inner loop power control is very easy to meet the requirement.
However, in a soft handover state, a handover area has multiple RLs, that is, the handover area has multiple cells, a network side has multiple sets of transmitters and receivers, a UE and the network side simultaneously maintain multiple RLs, and for uplink inner loop power control, the UE needs to consider uplink TPC commands of each RL to adjust uplink power of the UE, so that the method is reasonable under the condition that downlink reception quality meets a reliable requirement, however, due to the existence of fast fading in the handover area, downlink coupling loss of each RL may have a relatively large deviation, so that downlink reception quality of some of the RLs is unreliable, and uplink TPC commands thereof are ignored, so that the uplink TPC commands of the RL cannot be responded in time, and inner loop power control of the RL is not converged. This non-convergence of the inner loop power control causes the following drawbacks:
assuming that the UE keeps two radio links RL1 and RL2 in the handover area, if at a certain position, the uplink reception quality of RL1 is smaller than the uplink coupling loss of RL2, but its downlink coupling loss is larger than the downlink coupling loss of RL2, when the difference between the downlink coupling losses of RL1 and RL2 reaches a certain degree and the downlink reception quality of RL1 reaches below the "reliable" decision threshold of the UE terminal, the uplink TPC command of RL1 is considered unreliable and ignored, so the uplink transmission power at the UE side will be adjusted according to the TPC command of RL2 with high uplink reception quality, which will cause the uplink reception quality of RL1 to exceed the required value, wasting the uplink power. This condition is referred to as "uplink and downlink coupling loss imbalance between soft handover links". In addition, until now, this method has not specified the "reliable" requirement, causing inconsistent understanding of different commercial terminals, and thus the way in which various UEs in the handover area determine whether the reception quality is reliable is different.
The case of "the uplink and downlink coupling loss is balanced between the soft handover links" is removed, and the case of "the uplink and downlink coupling loss is balanced between the soft handover links" is, for example: assuming that the UE keeps two radio links RL1 and RL2 in a switching area, if at a certain position, the uplink coupling loss of RL1 is smaller than the uplink coupling loss of RL2, and the downlink coupling loss is also smaller than the downlink coupling loss of RL2, therefore, the inner loop power control of both uplink and downlink converges on RL 1. The downlink transmission power of RL1 plays a dominant role, the downlink transmission power of RL2 is low and does not contribute much to the UE reception quality, but the UE also consumes this share of the external power, i.e. one UE consumes excess power, thereby increasing the interference to other UEs, i.e. downlink interference. Therefore, in this case, the number of UEs accommodated by the network in the multi-cell scenario, that is, the downlink capacity is significantly reduced compared to that in the single-cell scenario; meanwhile, the uplink power of RL2 also interferes with the uplink power of other users in other cells, so the uplink capacity of the network is also reduced, but because the UE only has one transmitter to transmit the uplink air interface information 101, the uplink capacity of the network is reduced in a multi-cell scenario compared with a single-cell scenario, but is reduced less than the downlink capacity of the network. However, the actual situation is: in a 3G network, the amount of downlink air interface information is larger than that of uplink air interface information, for example, a user downloads a large amount of data from a network side, and the amount of uploaded data is relatively small, so the mechanism of the 3GPP method is contradictory to the actual requirement.
In addition to the above 3GPP method, there is also a cell Selection transmit Diversity Power Control (SSDT) method currently, where the method is a transmit Diversity method in a soft handover state of a network system, and the operation process is as follows: and maintaining an active set for the UE, wherein the active set is used for storing the cells with effective signals in the switching area, and the UE selects one cell from the active set as a main cell and the other cells are non-main cells. When the UE is in the switching area, only the main cell transmits the air interface information, but not the main cell stops transmitting the air interface information, so that the aim of reducing downlink interference is fulfilled. In addition, the method carries out fast switching through physical layer signaling, thereby reducing the high-level intervention of the base station. In order to distinguish the primary cell from the non-primary cell, the SSDT method needs to maintain a temporary flag for each wireless link in the active set, the UE notifies the primary cell to be distinguished by specifying the temporary flag of the primary cell link, and the UE notifies the network side that the cell is the primary cell through a Feedback Information (FBI) field in an uplink physical frame format.
The above-mentioned SSDT method has the disadvantages of being complex to implement, requiring the network side and the UE side to maintain temporary identities of the cells in the active set, and requiring the UE to measure the primary cell in an auxiliary manner and then inform the network side which cell is the primary cell through the uplink FBI. In addition, the method can be used only when the Common channel (P-CPICH) of WCDMA is used, so that the method has more limitations and cannot be used in any occasions; meanwhile, the network side may not use the true primary cell due to the UE measurement error or the FBI transmission error, thereby affecting the stability of the link power control.
Disclosure of Invention
In view of this, the main objective of the present invention is to provide a method for obtaining downlink transmission power of a base station system, so that when a UE is in a soft handover region, power is saved and uplink and downlink capacity of the system is improved.
In order to achieve the above purpose, the technical solution of the present invention is specifically implemented as follows:
a method for obtaining downlink transmission power of a base station system is characterized in that the method comprises the following steps:
a. a base station receives uplink information sent by a user terminal, demodulates a downlink TPC command included in the uplink information to obtain a downlink TPC command word, evaluates uplink receiving quality to obtain an uplink TPC command word, and generates a downlink transmitting power adjustment quantity according to the downlink TPC command word and the uplink TPC command word;
b. and c, acquiring a downlink transmitting power adjustment quantity according to a downlink power balance algorithm, and adding the downlink transmitting power adjustment quantity acquired by the downlink power balance algorithm, the downlink transmitting power adjustment quantity generated in the step a and the downlink transmitting power of the previous time slot to acquire the downlink transmitting power of the base station of the current time slot.
The specific steps of generating the downlink transmit power adjustment quantity according to the downlink TPC command word and the uplink TPC command word are as follows:
a11, obtaining the downlink transmission power adjustment quantity required by the downlink TPC command word according to the value of the downlink TPC command word;
a12, accumulating all uplink TPC command word values in a set time before the current time slot, and obtaining a downlink transmitting power adjustment request according to the accumulated value;
adding the downlink transmitting power adjustment amounts generated according to the uplink TPC command word in all time slots within the set time before the current time slot to obtain an accumulated value; then, adding the accumulated value and the product of the downlink transmission power adjustment request and the power control step length to obtain a sum value, and judging the sum value, if the sum value is smaller than the preset maximum adjustment quantity for increasing the downlink transmission power and larger than the preset maximum adjustment quantity for reducing the downlink transmission power, taking the product of the downlink transmission power adjustment request and the power control step length as the downlink transmission power adjustment quantity generated according to the uplink TPC command word; otherwise, taking zero as the adjustment quantity of the downlink transmitting power generated according to the uplink TPC command word;
a13, adding the downlink transmitting power adjustment quantity generated according to the uplink TPC command word and the downlink transmitting power adjustment quantity required by the downlink TPC command word to obtain the downlink transmitting power adjustment quantity generated according to the downlink TPC command word and the uplink TPC command word.
The specific steps of generating the downlink transmit power adjustment quantity according to the downlink TPC command word and the uplink TPC command word are as follows:
a21, accumulating all uplink TPC command word values in a set time before the current time slot, and acquiring a downlink transmitting power adjustment request according to the accumulated values;
adding the downlink transmitting power adjustment quantities generated according to the uplink TPC command word in all time slots within the set time before the current time slot to obtain an accumulated value; then, adding the accumulated value and the product of the downlink transmission power adjustment request and the power control step length to obtain a sum value, and judging the sum value, if the sum value is smaller than the preset maximum adjustment quantity for increasing the downlink transmission power and larger than the preset maximum adjustment quantity for reducing the downlink transmission power, taking the product of the downlink transmission power adjustment request and the power control step length as the downlink transmission power adjustment quantity generated according to the uplink TPC command word; otherwise, taking zero as the adjustment quantity of the downlink transmitting power generated according to the uplink TPC command word;
a22, performing tristate logical OR operation on the quotient of the downlink transmission power adjustment quantity generated according to the uplink TPC command word and the value of the downlink TPC command word, and multiplying the operation result by the power control step length to obtain a value which is the downlink transmission power adjustment quantity generated according to the downlink TPC command word and the uplink TPC command word.
The set time is a plurality of continuous time slots.
After the step a, further comprising:
b, judging the state of a preset joint inner ring power control algorithm switch, and if the switch is in an on state, executing the step b; otherwise, acquiring a downlink transmitting power adjustment quantity according to a downlink power balance algorithm, and adding the downlink transmitting power adjustment quantity acquired by the downlink power balance algorithm, the downlink transmitting power adjustment quantity generated according to the downlink TPC command word in the step a and the downlink transmitting power of the previous time slot to acquire the downlink transmitting power of the base station of the current time slot.
The specific process of obtaining the downlink transmitting power adjustment request according to the accumulated values of all uplink TPC command word values in the set time before the current time slot comprises the following steps:
if the accumulated value is less than the preset ultra-low accumulation threshold of the uplink TPC command word, an adjustment request for increasing the downlink transmission power is generated, if the accumulated value is greater than the preset ultra-high accumulation threshold of the uplink TPC command word, an adjustment request for reducing the downlink transmission power is generated, otherwise, an adjustment request of zero adjustment quantity is generated.
The value of the adjustment request for increasing the downlink transmission power is +1, the value of the adjustment request for reducing the downlink transmission power is-1, and the value of the adjustment request for the zero adjustment amount is zero.
The specific process of obtaining the downlink transmission power adjustment request according to the accumulated value of all uplink TPC command word values in the set time before the current time slot comprises the following steps:
if the accumulated value is less than the preset ultra-low accumulated threshold of the uplink TPC command word, generating an adjusting request for increasing the downlink transmitting power, otherwise, generating an adjusting request of zero adjusting quantity.
The value of the adjustment request for increasing the downlink transmission power is +1, and the value of the adjustment request for the zero adjustment amount is zero.
The specific process of obtaining the downlink transmission power adjustment request according to the accumulated value of all uplink TPC command word values in the set time before the current time slot comprises the following steps:
if the accumulated value is larger than the preset ultrahigh accumulated threshold of the uplink TPC command word, generating an adjusting request for reducing the downlink transmitting power, otherwise, generating an adjusting request of zero adjusting quantity.
The value of the adjustment request for reducing the downlink transmission power is-1, and the value of the adjustment request for the zero adjustment amount is zero.
The specific process of accumulating all uplink TPC command words within a set time before the current time slot includes:
a31, multiplying the value of each uplink TPC command word by 2, and subtracting 1 from the obtained product;
and a32, adding the values of all the uplink TPC command words processed in the previous step to obtain an accumulated value.
The method of the invention is based on the 3GPP protocol, and is easy to realize, so the inner loop power control performance in single link is not affected basically. And because the method increases the downlink transmitting power when the uplink receiving quality is ultrahigh, the problem of uplink receiving power waste in a switching area caused by the unbalanced state of uplink and downlink coupling loss between soft switching branches is effectively solved, the uplink switching gain is improved, and the larger the proportion of the soft switching area is, the more users in the soft switching area are, the more the saved power is, and the higher the uplink switching gain is. Simultaneously, the difference of fast fading of each RL downlink when the uplink and downlink coupling loss between soft handover branches is in an unbalanced state is effectively eliminated, so that the RL connection of a handover area is more stable; the method reduces the downlink transmitting power when the uplink receiving quality is ultra-low, thereby realizing that only the strongest downlink cell transmits information when the uplink and downlink coupling loss between the soft handover branches is balanced, and improving the uplink and downlink capacity of the base station system.
In addition, the method of the invention only modifies the flow of each base station at the network side in the prior art, does not modify the flow of the user terminal, and does not need to transmit information between different base stations, therefore, the invention can be compatible with various existing user terminals and can span different base stations.
Drawings
Fig. 1 is a schematic diagram of an inner loop power control loop of a 3GPP method in the prior art;
FIG. 2 is a schematic diagram of an inner loop power control loop of the method of the present invention;
fig. 3 is a block diagram illustrating an implementation of generating downlink transmission power at a network side according to an embodiment of the present invention;
fig. 4 is a block diagram of an uplink quality determining module and a limited power adjusting module according to a first embodiment of the present invention;
fig. 5 is a block diagram illustrating an implementation of generating downlink transmission power at a network side according to a second embodiment of the present invention;
fig. 6 is a block diagram of a structure of an uplink quality decision module and a limited power adjustment module according to a second embodiment of the present invention;
fig. 7 is a block diagram of a first structure of an uplink quality determining module and a limited power adjusting module according to a third embodiment of the present invention;
fig. 8 is a block diagram of a second structure of an uplink quality determining module and a limited power adjusting module according to a third embodiment of the present invention.
Detailed Description
The following further describes the implementation method of the invention by combining the attached drawings and specific embodiments.
The core idea of the present invention is shown in fig. 2, wherein a solid arrow indicates a downlink inner loop power control process of the method of the present invention, when performing downlink inner loop power control, the method of the present invention adjusts downlink transmit power on a network side according to downlink reception quality and uplink reception quality at the same time, if the uplink reception quality is ultrahigh, the downlink transmit power is increased, and if the uplink reception quality is ultralow, the downlink transmit power is decreased, thereby interconnecting two inner loop power control loops operating independently at the network side. Therefore, the method of the present invention is called as a joint Inner Loop Power Control algorithm (UILPC).
According to the above thought, the invention discloses a method for obtaining downlink transmitting power of a base station system, the general flow of the method is as follows:
a. a base station receives uplink information sent by a user terminal, demodulates a downlink TPC command included in the uplink information, obtains a command word of the downlink TPC command, evaluates uplink receiving quality, obtains an uplink TPC command word, and generates a downlink transmission power adjustment quantity according to the downlink TPC command word and the uplink TPC command word;
b. and c, acquiring a downlink transmitting power adjustment quantity according to the downlink power balance algorithm, and adding the downlink transmitting power adjustment quantity acquired by the downlink power balance algorithm, the downlink transmitting power adjustment quantity generated in the step a and the downlink transmitting power of the previous time slot to acquire the downlink transmitting power of the base station system of the current time slot.
The method of the present invention can be used for power control of a base station in a third generation communication network, and is particularly suitable for power control in a WCDMA frequency duplex (FDD) system and a CDMA FDD system.
In the above general flow, there are various ways for the base station to generate the downlink transmit power adjustment amount according to the downlink TPC command word and the uplink TPC command word at the same time, so the present invention has a plurality of specific embodiments, and each embodiment is specifically described below.
The first embodiment is as follows:
fig. 3 is a block diagram of a first implementation of generating downlink transmit power at a network side according to an embodiment of the method of the present invention, where as shown in fig. 3, P (k) is the downlink transmit power of the kth time slot; p (k-1) is the downlink transmission power of the k-1 time slot, and the value of P (k-1) is obtained from the recorded historical data; pbal (k) is the downlink transmission power adjustment amount required by the downlink power balancing method in the kth time slot, and the downlink power balancing algorithm is a well-known algorithm in the industry and will not be described herein; ptpc (k) is a downlink transmit power adjustment required by a downlink TPC command word in the kth slot, and the obtaining method of Ptpc (k) is as follows: the base station demodulates a downlink TPC command TPCdl (k) from the received uplink air interface information 101, determines the value of TPCdl (k), and if the value of TPCdl (k) is +1, ptpc (k) is + Δ [ ] TPC If TPCdl (k) has a value of 0, ptpc (k) is-. DELTA. TPC 。
In fig. 3, tpcui (k) is an uplink TPC command word in the kth time slot, and the method for acquiring tpcui (k) is as follows: the base station evaluates the uplink receiving quality, generates an uplink TPC command according to an evaluation result, wherein the uplink TPC command comprises TPCul (k), if the uplink TPC command requires to increase the uplink transmitting power, the TPCul (k) is +1, and if the uplink TPC command requires to reduce the uplink transmitting power, the TPCul (k) is 0; ulest (k) is a downlink power adjustment request obtained in the kth time slot according to the uplink TPC command word; pun (k) is a downlink transmission power adjustment quantity generated in the kth time slot according to the uplink TPC command word. The P (k-1), ptp c (k), and Pbal (k) are input to an adding unit 303 for summation, and the sum is input to an adding unit 304, the tpcui (k) is input to an uplink quality decision module 301, the uplink quality decision module 301 processes the input tpcui (k) and outputs a request Ulest (k) for adjusting downlink power, a limited power adjustment module 302 processes the Ulest (k), outputs Pun (k) and inputs the Pun (k) to the adding unit 304 through a UILPC switch, and if the UILPC switch is in an on state, the adding unit 304 outputs a final P (k) value as: p (k-1) + Ptpc (k) + Pun (k) + Pbal (k), otherwise, the adding unit 304 outputs the final P (k) value as: p (k-1) + Ptpc (k) + Pbal (k).
According to fig. 3, the downlink transmission power of the k-th slot on the rl network side can be obtained according to the following formula (4):
in the above equation (4), the United ILPC Switch = 'used' indicates that the UILPC Switch is in the "on" state, and the United ILPC Switch = 'noursed' indicates that the UILPC Switch is in the "off" state. Since P (k-1) is known, the acquisition methods of Pbal (k) and Ptpc (k) are the same as the 3GPP protocol of the prior art, and thus the following description is a specific method for acquiring Pun (k).
After receiving the uplink air interface information 101, the base station network side receiver evaluates an uplink signal-to-interference ratio (SIR), generates an uplink TPC command according to the SIR, and sends a command word of the uplink TPC command to the uplink quality decision module 301 for processing, wherein the specific processing process comprises the following steps:
obtaining the accumulated value delta sum of the uplink TPC command words of the set time before the current time slot according to the following formula (5) ulTPC (k)：
In formula (5), UL _ TPC _ Sum _ Window _ Size is an accumulation sliding Window, which represents the number of slots in a set time before the current slot, and TPCul (i) is the value of the uplink TPC command word of the ith slot.
The uplink quality decision module 301 obtains a downlink power adjustment request Ulest (k) according to the following formula (6):
in the formula (6), unlest (k) of +1 indicates that the transmission power is increased, unlest (k) of-1 indicates that the transmission power is decreased, and unlest (k) of 0 indicates that the transmission power is not adjusted. TPC _ Sum _ NegLimit is a preset ultra-low accumulation threshold of uplink TPC command words, TPC _ Sum _ PosLimit is a preset ultra-high accumulation threshold of uplink TPC command words, and if delta Sum is greater than ulTPC (k) If the Sum is less than TPC _ Sum _ NegLimit, the accumulated value of the uplink TPC command words in the set time before the current time slot is ultra-low, and further the uplink receiving quality is ultra-high, at this time, ulest (k) is set to be +1; if Δ sum ulTPC (k) If the Sum is greater than TPC _ Sum _ PosLimit, the accumulated value of the uplink TPC command words in the set time before the current time slot is ultrahigh, and further the uplink receiving quality is ultralow, at this time, ulest (k) is set to-1; otherwise, ulest (k) is set to 0.
The UL _ TPC _ Sum _ Window _ Size and TPC _ Sum _ NegLimit are used to screen the adjustment timing of "increasing the downlink transmission power when the uplink reception quality is ultrahigh"; the UL _ TPC _ Sum _ Window _ Size and TPC _ Sum _ PosLimit described above are used to screen the adjustment timing for "lowering the downlink transmit power when the uplink reception quality is ultra-low".
Sending a downlink power adjustment request Ulest (k) to the limited power adjustment module 302, the limited power adjustment module 302 firstly obtaining Pun (k) in the current time slot according to the following formula (7):
in the above formula (7), Δ TPC A certain power control step length, a power adjustment amount of a certain power control step length, and a + delta TPC Power-delta representing an increase of a certain power control step TPC Indicating a reduction of power, Δ, by a certain power control step UNsum (k) Generating downlink transmitting power according to uplink TPC command word in set time before current time slotAccumulated value of adjustment amount, delta UNsum (k)+Δ TPC Showing the accumulated value of the downlink transmission Power adjustment quantity generated according to the uplink TPC command word in the current time slot and the preset time before the current time slot, wherein Power _ Adjust _ PosLimit is the maximum adjustment quantity for improving the downlink transmission Power, power _ Adjust _ NegLimit is the maximum adjustment quantity for reducing the downlink transmission Power, and delta UNsum (k) Obtained according to equation (8):
in the above equation (8), UN _ Power _ Adjusting _ Window _ Size is an adjustment Window indicating the number of slots included in the set time before the current slot, P un (i) And generating a downlink transmission power adjustment quantity for the ith time slot according to the uplink TPC command word. The Power _ Adjust _ Power _ limit and the adjustment sliding Window "UN _ Power _ Adjusting _ Window _ Size" are used for limiting the highest adjustment total amount of the downlink transmission Power, so that the total amount of adjustment amounts of a plurality of times continuously does not exceed a certain amount; the above Power _ Adjust _ new _ limit and the adjustment sliding Window "UN _ Power _ Adjusting _ Window _ Size" are used to limit the minimum adjustment amount of the downlink transmission Power, so that the total amount of adjustment amount is not more than a certain amount after several times of continuous reduction.
Fig. 4 is a block diagram of a first embodiment of a structure in which an uplink quality determining module 301 and a limited power adjusting module 302 implement the foregoing method: the uplink quality decision module 301 includes D flip-flops of UL _ TPC _ Sum _ Window _ Size, which are used to record TPCul (i) from the kth-UL _ TPC _ Sum _ Window _ Size to the kth-1 th time slot, and input the recording result to an adder 401 for summation, and then input the summation result to a decision device 402, where the decision condition of the decision device 402 is: if the input value is less than TPC _ Sum _ NegLimit, the output Ul est (k) Is +1, if the input value is greater than TPC _ Sum _ PosLimit, the output Ul est (k) Is-1, otherwise, the output Ul est (k) Is 0. The limited Power adjustment module 302 includes UN _ Power _ Adjusting _ Window _ Size D touchesA transmitter for recording the downlink transmit Power adjustment amount Pun (i) from the k-UN _ Power _ Adjusting _ Window _ Size time slot to the k-1 time slot, and inputting the recording result to an adder 403, wherein the Ul is the sum of the Uh and the Uh est (k) Is also input to the adder 403, the output of the adder 403 is input to a multiplier 407, and the multiplier 407 multiplies the input by Δ TPC Then, the result is input to the decider 404, and the decision condition of the decider 404 is: if the input is more than Power _ Adjust _ NegLimit and less than Power _ Adjust _ PosLimit, outputting +1; otherwise, 0 is output. The outputs of the decision device 402 and the decision device 404 are further processed by a multiplier 405 and a multiplier 406 to output Pun (k), wherein the factors of the multiplier 406 and the multiplier 407 are Δ TPC 。
The second embodiment:
the difference between this embodiment and the first embodiment is: the base station generates a downlink transmit power adjustment quantity according to the uplink TPC command and the downlink TPC command at the same time. FIG. 5 shows the generation of downlink transmit power at the network side according to the second embodimentImplementing the block diagram, as shown in fig. 5, P (k) is the downlink transmission power of the kth timeslot; p (k-1) is the downlink transmitting power of the k-1 time slot; pbal (k) is a downlink transmission power adjustment amount required by a downlink power balancing algorithm in a kth time slot, TPCdl (k) is a command word of a downlink TPC command in the kth time slot, and the value of the downlink TPC command word is generally 0 or 1. When 0, it means that the TPC command is for reducing the transmission power; a value of 1 indicates that the TPC command is used to increase the transmit power. TPCul (k) is an uplink TPC command word in the kth time slot; ulest (k) is a downlink power adjustment request obtained in the kth time slot according to the uplink TPC command word; pun (k)' is a power adjustment request generated in the kth time slot output by the limited power adjustment module 501 according to the uplink TPC command word, and has a value of: pun (k)' = Pun (k)/Δ TPC Pun (k) is a downlink transmit power adjustment amount generated according to the uplink TPC command word in the kth time slot, and the corresponding value is: + Delta TPC 、-Δ TPC Or 0, therefore, the value corresponding to Pun (k)' is +1, -1 or 0, if the value is +1, it indicates that the downlink transmission power is increased; if it has a value ofIs-1, which means that the downlink transmitting power is reduced; if the value is 0, it indicates that the downlink transmission power is not adjusted. Pun (k)' is input to a tristate logic or unit 503 through a UILPC switch 502, tpcdl (k) is also input to the tristate logic or unit 503, and the corresponding relationship of input and output of the tristate logic or unit 503 is shown in table 1:
TABLE 1
As shown in table 1, by the tri-state logical or unit, if Pun (k)' is +1, then +1 is output, and the downlink transmission power is increased; if Pun (k)' is-1, outputting-1, and reducing the downlink transmitting power. If Pun (k)' is 0, it indicates that the uplink reception quality is neither ultra-high nor ultra-low, and it belongs to normal convergence, and the output of the tri-state logical OR unit is determined by the value of the downlink TPC command word, thereby realizing that the uplink reception quality is over-highThe downlink transmitting power is increased at high time, and the downlink transmitting power is reduced when the uplink receiving quality is ultra-low, so that the method in the first embodiment is simplified. The power adjustment request output from the tri-state logic OR unit 503 is multiplied by Δ via a multiplier 504 TPC Then, the signal is input to the adder 505, and P (k-1) and Pbal (k) are also input to the adder 505.
According to fig. 5, the downlink transmission power of the k-th slot on the rl network side can be obtained according to the following equation (9):
in the above formula (9), | | is a tri-state logical or operator, and Ptpc (k) is a downlink transmit power adjustment amount required by the downlink TPC command, and its value is obtained according to the formula (10):
Ptpc(k)＝Δ TPC ×TPCdl(k) (10)
pun (k)' is based on: pun (k)'＝Pun(k)/Δ TPC The value of Pun (k) may be obtained by the above-described formula (5), formula (6), formula (7), and formula (8).
Fig. 6 is a block diagram illustrating the structure of the uplink quality determining module 301 and the limited power adjusting module 501 according to the second embodiment. The uplink quality determination module 301 includes N D triggers, and the value of N is fixed, for example, fixed to 16, the setting range of tpc _sum _neglimitis: 0 to N; the module structure of the finite power adjustment module 501 is similar to that of the finite power adjustment module 302, except that the multiplier 406 at the output terminal is eliminated, and the output is Pun (k)'.
Example three:
the present embodiment is simplified for a limited power adjustment module. Fig. 7 is a block diagram of the structure of the uplink quality decision module 301 and the limited power adjustment module 701 after the limited power adjustment module 302 is simplified, in the communication between the RL network side and the UE side, each frame includes 15 time slots, 15D flip-flops in the uplink quality decision module 301 are used to record a TPC command word in one frame, the setting range of TPC _ Sum _ NegLimit in the decision device 402 is-15 to 0, and the setting range of TPC _sum _ pos limit is: 0 to 15; the finite power adjustment module 701 is a much greater simplification than the finite power adjustment module 302, which includes a frame timing clock 702,the frame timing clock 702 sends a trigger signal once in each frame to trigger the adder 401 and the variable counting delay 703 to operate, and the variable counting delay 703 is triggered once to output 1 within a period from the start of triggering, the period being the sum of Z slot clock cycles, and after the period, 0 is output until the next triggering, Z is a preset integer value ranging from 0 to 15. The output of the variable counting delay 703 is multiplied by the output of the decision device 402 by the multiplier 405, and then multiplied by Δ through the multiplier 406 TPC And outputting after multiplication.
Fig. 8 is a block diagram of the structure of the uplink quality decision module 301 and the limited power adjustment module 801 after the limited power adjustment module 302 is simplified, where the structure of the limited power adjustment module 801 is similar to that of the limited power adjustment module 701, except that the output of the variable counting delay 703 and the output of the decision device 402 are multiplied by the multiplier 405 and then directly output.
In the third embodiment, the downlink transmission power is adjusted only in the first several time slots of each frame according to the uplink TPC command word, and the last several time slots are not adjusted according to the uplink TPC command word. According to fig. 7, if the state of the UILPC switch is 0, P (k) of the kth slot is: p (k-1) + Ptpc (k) + Pbal (k); otherwise, the downlink transmit power P (15 × m + k) at the kth time slot in the mth frame is: p (15 + m + k-1) + Ptpc (15 + m + k) + Pbal (15 + m + k) + Pun (15 + m + k). Wherein, P (15 × m + k-1) is the downlink transmission power of the 15 × m + k-1 time slot; ptpc (15 × m + k) is the downlink transmit power adjustment amount required by the downlink TPC command in the 15 × m + k time slot; pbal (15 + m + k) is a downlink transmit power adjustment amount required by the downlink power balance algorithm in the 15 th time slot m + k, and Pun (15 + m + k) is a downlink transmit power adjustment amount generated according to the uplink TPC command word in the 15 th time slot m + k, where Pun (15 + m + k) is obtained according to the following formula (11):
in the above equation (11), Z is a preset integer value ranging from 0 to 15, where: ul est (m-1) is a downlink transmission power adjustment request of the (m-1) th frame, and the value is obtained according to the following formula (12):
in the above formula (12), Δ sum ulTPC (m-1) is the accumulated value of the uplink TPC command word of the (m-1) th frame, TPC _ Sum _ NegLimit is a preset TPC ultra-low accumulated threshold, and the set range of the value is as follows: 15-0, TPC _Sum _PosLimitis a preset TPC ultrahigh accumulation threshold, and the set range of the value is as follows: 0 to 15. Said Δ sum ulTPC (m-1) is obtained according to the following formula (13):
in the above equation (13), tpcui (i) is the value of the uplink TPC command word of the ith slot.
Due to Δ sum ulTPC (m-1) is the accumulated value of the uplink TPC commands of one frame, and the number of slots of one frame is fixed to be 15, so that Δ sum is obtained ulTPC (m-1), a sliding window mechanism is not required, and the accumulated number is only required to be fixed to 15.
In the above three embodiments, it is determined whether the uplink reception quality is ultra-high or the uplink reception quality is ultra-low through the set TPC command word ultra-low accumulation threshold TPC _ Sum _ NegLimit and the set TPC command word ultra-high accumulation threshold TPC _ Sum _ PosLimit, so as to implement two mechanisms, where the first mechanism is "increase the downlink transmission power when the uplink reception quality is ultra-high", and the second mechanism is "decrease the downlink transmission power when the uplink reception quality is ultra-low".
If the UE is in a cell and the network system communicates with a single wireless link, the convergence requirement is easily met due to the convergence of the inner loop power control, and at the moment, the uplink receiving quality is not ultra-high or ultra-low, and the downlink transmitting power does not need to be adjusted according to the uplink receiving quality. Therefore, the method of the invention has little influence on the single wireless link and does not need to distinguish whether the wireless link is in a soft switching state or not.
If the UE is in the switching area of a plurality of cells, the UE has a plurality of RLs, and when the uplink and downlink coupling loss between the soft switching branches is unbalanced, the UE adjusts the uplink transmitting power according to the TPC command of the RL with large uplink coupling loss, so that the uplink receiving quality of the RL with small uplink coupling loss is ultrahigh, and the uplink power is wasted. According to the method of the invention, when the RL uplink receiving quality is ultrahigh, the downlink transmitting power of the RL is properly increased to improve the downlink receiving quality of the RL, so that the UE does not ignore the downlink air interface information 102 of the RL, demodulates the uplink TPC command of the RL, and then adjusts the uplink transmitting power according to the TPC command to finally make the uplink inner loop power control converge and save the power. When the uplink and downlink coupling loss between soft handover branches is balanced, the uplink inner loop power control converges on the RL with small uplink coupling loss, so that the uplink receiving quality of the RL with large uplink coupling loss is ultra-low. At this time, the downlink inner loop power control is also converged on the RL with small downlink coupling loss, the contribution of the transmit power of the RL with large downlink coupling loss to downlink reception is not large, but the UE also consumes the downlink transmit power of the RL, and the downlink capacity is not high. According to the method of the invention, when the uplink receiving quality is ultra-low, the downlink transmitting power is reduced until the downlink transmitting power is reduced to the lowest, so that the downlink transmitting power consumed by the UE is reduced to be low, thereby improving the uplink and downlink capacity. When the downlink transmitting power is adjusted to the lowest, the effect is equivalent to that achieved by the SSDT method in the prior art, but the method provided by the invention is much simpler in implementation mechanism than the SSDT method.
The two mechanisms provided by the invention can play a complementary role: suppose that the UE moves from cell 1 to cell 2 in the soft handover region, the radio link corresponding to cell 1 is RL1, and the radio link corresponding to cell 2 is RL2. When the UE is in the main coverage area of the cell 1, the UE is in a state of 'balance of coupling loss between uplink and downlink of soft handover branches', the uplink receiving quality of the RL2 is ultralow, the downlink transmitting power of the RL2 is adjusted to the minimum value according to the adjusting action of a mechanism of 'reducing the downlink transmitting power when the uplink receiving quality is ultralow', the uplink and downlink inner loop power control is converged in the RL1, and the uplink and downlink capacity is improved. Along with the movement of the UE to the cell 2, the uplink coupling loss of the RL2 is smaller than the RL1, at the moment, because the downlink transmitting power of the RL2 is the minimum value, the downlink receiving quality of the RL2 is lower than the receiving quality of the RL1, the uplink receiving quality of the RL2 is ultrahigh, the phenomenon of unbalanced uplink and downlink coupling loss among soft switching branches occurs, because the mechanism of increasing the downlink transmitting power when the uplink receiving quality is ultrahigh adjusts the downlink transmitting power of the RL2, at the moment, the UE is positioned in the main coverage area of the cell 2, and then the state of balanced uplink and downlink coupling loss among soft switching branches is achieved, at the moment, the receiving quality of the RL1 is ultralow, the downlink transmitting power of the RL1 is adjusted to the minimum value according to the adjusting action of the mechanism of decreasing the downlink transmitting power when the uplink receiving quality is ultralow, the uplink and downlink inner ring power control are converged in the RL2, and the power control of the switching areas is successfully completed.
The method according to the invention can also simplify the three embodiments described above according to the specific situation in practical application: only setting the ultra-low accumulation threshold TPC _ Sum _ NegLimit of the TPC command word or only setting the ultra-high accumulation threshold TPC _ Sum _ PosLimit of the TPC command word, and respectively and independently realizing a mechanism of increasing the downlink transmitting power when the uplink receiving quality is ultra-high or a mechanism of reducing the downlink transmitting power when the downlink receiving quality is ultra-low, thereby solving the problem of uplink power waste when the uplink and downlink coupling loss between soft switching branches is unbalanced or solving the problem of low uplink and downlink capacity when the uplink and downlink coupling loss between soft switching branches is balanced.
Example four:
the present embodiment is a simplification of the first embodiment, and the fourth embodiment only implements the mechanism of "increasing the downlink transmission power when the uplink reception quality is ultra high".
Fig. 3 is a block diagram of implementation of generating downlink transmit power on the network side in the fourth embodiment, where the block diagram of implementation is the same as the block diagram of implementation of the first embodiment, in the fourth embodiment, the downlink transmit power of the kth time slot on the RL network side is obtained according to the above formula (4), and the Pun (k) in the formula (4) is obtained according to the following formula (7'):
delta in the above formula (7') UNsum (k) Obtained according to the above equation (8), ulest (k) is obtained according to the following equation (6'):
Δ sum in the above formula (6') ulTPC (k) Obtained according to the above formula (5).
In the fourth embodiment, the structure of the uplink quality determining module and the limited power adjusting module is the same as that shown in fig. 4, except that the determining conditions of the determiner 402 and the determiner 404 are different, in this embodiment, the determining conditions of the determiner 402 are: if the input value is less than TPC _ Sum _ NegLimit, the output Ul est (k) Is +1, otherwise, the output Ul est (k) Is 0; the decision conditions of the decider 404 are: if the input is less than Power _ Adjust _ PosLimit, outputting +1; otherwise, 0 is output.
Example five:
in this embodiment, the second embodiment is simplified, and the fifth embodiment also only implements the mechanism of "increasing the downlink transmission power when the uplink reception quality is ultrahigh".
Fig. 5 is a block diagram of an implementation of generating downlink transmission power on the network side in the fifth embodiment, where the block diagram is the same as the block diagram of the implementation of the second embodiment, in the fifth embodiment, the downlink transmission power of the kth timeslot on the RL network side is obtained according to the above formula (9), and the Pun (k) in the formula (9) is obtained according to the above formula (5), formula (8), formula (6 '), and formula (7'):
in this fifth embodiment, the structures of the uplink quality determining module and the limited power adjusting module are the same as those of the uplink quality determining module and the limited power adjusting module in the second embodiment shown in fig. 6, except that the determining conditions of the determiner 402 and the determiner 404 are different, in this embodiment, the determining conditions of the determiner 402 are: if the input value is less than TPC _ Sum _ NegLimit, the output Ul est (k) Is +1, otherwise, the output Ul est (k) Is 0; the decision conditions of the decider 404 are: if the input is less than Power _ Adjust _ PosLimit, outputting +1; otherwise, 0 is output.
Example six:
in this embodiment, the third embodiment is simplified, and the sixth embodiment also only implements the mechanism of "increasing the downlink transmission power when the uplink reception quality is ultrahigh".
In the sixth embodiment, if the state of the UILPC switch is 0, P (k) of the kth time slot is: p (k-1) + Ptpc (k) + Pbal (k); otherwise, the downlink transmit power P (15 × m + k) at the kth time slot in the mth frame is: p (15 + m + k-1) + Ptpc (15 + m + k) + Pbal (15 + m + k) + Pun (15 + m + k). Where Pun (15 × m + k) is obtained according to the following equation (11'):
in the above formula (11'), Z is a preset integer value ranging from 0 to 15, wherein: ul est (m-1) is a downlink transmit power adjustment request for the (m-1) th frame, and the value thereof is obtained according to the following formula (12'):
in the above formula (12'), Δ sum ulTPC (m-1) is the accumulated value of the uplink TPC command word of the (m-1) th frame, TPC _ Sum _ NegLimit is a preset TPC ultra-low accumulated threshold, TPC _ Sum _ PosLimit is a preset TPC ultra-high accumulated threshold, and the setting range of the value is as follows: -15 to 0. Said Δ sum ulTPC (m-1) is obtained according to the above formula (13):
in the sixth embodiment, the uplink quality determining module has the same structure as the uplink quality determining module shown in fig. 7 and 8, except that the determining conditions of the determiner 402 are different, and the determining conditions of the determiner 402 are: if the input value is less than TPC _ Sum _ NegLimit, the output Ul est (k) Is +1, otherwise, the output Ul est (k) Is 0.
The fourth, fifth and sixth embodiments only implement the "increase the downlink transmission power when the uplink reception quality is ultra-high" mechanism, and the method can also implement the "decrease the downlink transmission power when the uplink reception quality is ultra-low" mechanism, only by using the decision deviceThe decision condition of 402 is instead: if the input value is greater than TPC _ Sum _ PosLimit, the output Ul est (k) Is-1, otherwise, the output Ul est (k) Is 0; the decision condition of the decider 404 is changed to: if the input value is larger than Power _ Adjust _ NegLimit, outputting-1; otherwise, 0 is output.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (12)
1. A method for obtaining downlink transmission power of a base station system is characterized in that the method comprises the following steps:
a. a base station receives uplink information sent by a user terminal, demodulates a downlink TPC command included in the uplink information to obtain a downlink TPC command word, evaluates uplink receiving quality to obtain an uplink TPC command word, and generates a downlink transmitting power adjustment quantity according to the downlink TPC command word and the uplink TPC command word;
b. and c, acquiring a downlink transmitting power adjustment quantity according to a downlink power balance algorithm, and adding the downlink transmitting power adjustment quantity acquired by the downlink power balance algorithm, the downlink transmitting power adjustment quantity generated in the step a and the downlink transmitting power of the previous time slot to acquire the downlink transmitting power of the base station of the current time slot.
2. The method of claim 1, wherein the step of generating the downlink transmit power adjustment based on the downlink TPC command words and the uplink TPC command words comprises:
a11, obtaining the downlink transmission power adjustment quantity required by the downlink TPC command word according to the value of the downlink TPC command word;
a12, accumulating all uplink TPC command word values in a set time before the current time slot, and obtaining a downlink transmitting power adjustment request according to the accumulated value;
adding the downlink transmitting power adjustment amounts generated according to the uplink TPC command word in all time slots within the set time before the current time slot to obtain an accumulated value; then, adding the accumulated value and the product of the downlink transmission power adjustment request and the power control step length to obtain a sum value, and judging the sum value, if the sum value is smaller than the preset maximum adjustment quantity for increasing the downlink transmission power and larger than the preset maximum adjustment quantity for reducing the downlink transmission power, taking the product of the downlink transmission power adjustment request and the power control step length as the downlink transmission power adjustment quantity generated according to the uplink TPC command word; otherwise, taking zero as the adjustment quantity of the downlink transmitting power generated according to the uplink TPC command word;
a13, adding the downlink transmitting power adjustment quantity generated according to the uplink TPC command word and the downlink transmitting power adjustment quantity required by the downlink TPC command word to obtain the downlink transmitting power adjustment quantity generated according to the downlink TPC command word and the uplink TPC command word.
3. The method of claim 1, wherein the step of generating the downlink transmit power adjustment based on the downlink TPC command word and the uplink TPC command word comprises:
a21, accumulating all uplink TPC command word values in a set time before the current time slot, and acquiring a downlink transmitting power adjustment request according to the accumulated values;
adding the downlink transmitting power adjustment amounts generated according to the uplink TPC command word in all time slots within the set time before the current time slot to obtain an accumulated value; then, adding the accumulated value and the product of the downlink transmission power adjustment request and the power control step length to obtain a sum value, and judging the sum value, if the sum value is smaller than the preset maximum adjustment quantity for increasing the downlink transmission power and larger than the preset maximum adjustment quantity for reducing the downlink transmission power, taking the product of the downlink transmission power adjustment request and the power control step length as the downlink transmission power adjustment quantity generated according to the uplink TPC command word; otherwise, taking zero as the adjustment quantity of the downlink transmitting power generated according to the uplink TPC command word;
a22, performing tri-state logical or operation on the quotient of the downlink transmit power adjustment quantity generated according to the uplink TPC command word and the value of the downlink TPC command word, and multiplying the operation result by the power control step length to obtain a value as the downlink transmit power adjustment quantity generated according to the downlink TPC command word and the uplink TPC command word.
4. A method as claimed in claim 2 or 3, wherein the set time is a number of consecutive time slots.
5. The method of claim 1, wherein after step a, further comprising:
b, judging the state of a preset joint inner ring power control algorithm switch, and if the switch is in an on state, executing the step b; otherwise, acquiring a downlink transmitting power adjustment quantity according to a downlink power balance algorithm, and adding the downlink transmitting power adjustment quantity acquired by the downlink power balance algorithm, the downlink transmitting power adjustment quantity generated according to the downlink TPC command word in the step a and the downlink transmitting power of the previous time slot to acquire the downlink transmitting power of the base station of the current time slot.
6. The method as claimed in claim 2 or 3, wherein the specific process of obtaining the downlink transmit power adjustment request according to the accumulated value of all uplink TPC command word values within a preset time before the current slot comprises:
if the accumulated value is less than the preset ultra-low accumulation threshold of the uplink TPC command word, an adjustment request for increasing the downlink transmission power is generated, if the accumulated value is greater than the preset ultra-high accumulation threshold of the uplink TPC command word, an adjustment request for reducing the downlink transmission power is generated, otherwise, an adjustment request of zero adjustment quantity is generated.
7. The method of claim 6, wherein the value of the adjustment request for increasing the downlink transmission power is +1, the value of the adjustment request for decreasing the downlink transmission power is-1, and the value of the adjustment request for zero adjustment amount is zero.
8. The method of claim 2 or 3, wherein the specific process of obtaining the downlink transmit power adjustment request according to the accumulated value of all uplink TPC command word values within a set time before the current time slot comprises:
if the accumulated value is less than the preset ultra-low accumulated threshold of the uplink TPC command word, generating an adjusting request for increasing the downlink transmitting power, otherwise, generating an adjusting request of zero adjusting quantity.
9. The method of claim 8, wherein the value of the adjustment request for increasing the downlink transmission power is +1, and the value of the adjustment request for the zero adjustment amount is zero.
10. The method of claim 2 or 3, wherein the specific process of obtaining the downlink transmit power adjustment request according to the accumulated value of all uplink TPC command word values in a preset time before the current time slot comprises:
if the accumulated value is larger than the preset ultrahigh accumulated threshold of the uplink TPC command word, generating an adjustment request for reducing the downlink transmitting power, otherwise, generating an adjustment request of zero adjustment quantity.
11. The method of claim 10, wherein the adjustment request for reducing the downlink transmission power has a value of-1, and the adjustment request for the zero adjustment amount has a value of zero.
12. The method of claim 2 or 3, wherein the step of accumulating all uplink TPC command words within a predetermined time before the current time slot comprises:
a31, multiplying the value of each uplink TPC command word by 2, and subtracting 1 from the obtained product;
and a32, adding the values of all the uplink TPC command words processed in the previous step to obtain an accumulated value.
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| CN1705246A (en) | 2005-12-07 |
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