TW448642B - Base station transmit power control in a CDMA cellular telephone system - Google Patents

Abstract

A power control method in accordance with the present invention synchronizes the transmit power levels at the base stations currently serving a mobile station and an initial transmit power level of a new target base station being added in a diversity handover situation. At the beginning of the handover, a radio network controller orders the serving base stations to measure their respective transmit powers to the mobile station. Each serving base station then measures its transmit power to the mobile station and reports the power level measurements to the radio network controller. An initial transmit power setting is determined for the target base station, and new transmit power settings are determined for the serving base stations synchronized for example to a particular time (t0). At or about synchronizing time t0, the target base station transmits to the mobile station at the initial power setting, and at or about the same time, the serving base stations preferably also adjust their transmit powers toward the new values. Alternatively, the serving base stations transmit at their respective new values at or about time t0. In a preferred embodiment of the present invention, the serving base station power adjustment is performed gradually.

Description

Luxury No.J 88100328 4 48 6 4 February Amendment V. Invention Description U) Related Applications This Application Request 1 197 7 1 2 Case No. 6 0/0 6 9, 5-1 1 and 1 No. 60/090, 236. Priority of the Invention Field of the Invention The present invention relates to the delivery situation in the proximity of a cell phone system. Background and Overview of the Invention In a cell communication system, calls are made on an electrical channel. Several base stations are connected to the network connector, which will face. From external network to mobile station This network connector passes through one or more base stations. Base station calls communication channel. Information transmitted between code division multiple direction (CDMA) stations is mathematically distinguished from other mobile stations or related information. Therefore, it can be identified on the basis of this. In CDMA, applications such as Garg, Vijay K., etc., Prentice-Hall (transmission is dispersed by two or more (" generates a received signal. Apply from this base station to another base station on the 15th of the month U.S. provisional patent application June 22, 998. The serial number of the application. The present invention is particularly related to the transmission of power control to multiple base stations. The mobile radio station and the base station are wirelessly connected to a switching node, which is a typical cell. Calls from communication systems and other communication systems are directed to network connectors, and from multiple switching nodes to mobile stations that serve the called mobile and called, and to establish a radio mobile communication system, base stations and mobile codes, sometimes Called the spreading code modulation to use the same radio band as the base station, there are individual radio channels 11 " The different characteristics of these ciphers are published in one or more manuals by CDMA and wireless / personal communication I 9 9 7) Publishing. Spread spectrum communication enables action II) The base station can receive and process at the same time, so as to combine the signal's ability to perform handover (or from the antenna part to the same base

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448 642 88100328 L Year / Month Revision V. Description of Invention (2) Another part of the station. This kind of handover is common to many base stations, and it is common to change the node transmission, and in CDMA, when the call is directed, this set of handover is more likely to occur at birth. . In a mobile system, a mobile station can assign a call to the same communication that occurred while processing this mobile station. The intensity and degree are many. Therefore, the mobile station transmits the base station's transmit power and capacity in the CDMA frequency band. In addition, it is farther from the base station. As a result, the situation is immediate, the distance rate control of the letter of reach. ), And unaware of voice or data communications is called " diversity handover ". During the variable delivery, the self-signal and voice information are combined in the quality of the received data. This common point is in the opposite direction of the connection with the base station, and the voice and signal information are combined from many base stations. Provide " soft " and " softer " diversity delivery. After the softswitch moves to the edge source of the unit, the base station of the adjacent unit uses the transceiver, and now the base station continues to process the call. The second base station processes it in a pre-interruption manner. Soft split Handle the two base stations of this call until the mobile station moves to the called base station which is the nearest base station. Softer Diversity Handover between two different parts of the same base station. All users in the communication system send information at the same time. Each user's communication will interfere with one base station of another user. Signals received from mobile stations close to the base station The signals of other mobile stations on the border of the base unit are strong and strong. The communication of the remote mobile stations is obscured by the short-range mobile stations, which is often referred to as the near-far effect. effect) '1. To increase capacity by reducing unwanted interference, all lines reach the base station at approximately the same power regardless of their distance. Therefore, the uplink (or reverse) (TPC) from the mobile station to the base station is an important factor to improve the performance of the CDMA system. The mobile station attempts to control its transmitting power based on the signal strength.

_ Hip; 0: \ 56 \ 56102.ptc page 7 correction 448642 88100328 month 5. correction of the invention (3) rate to generate the signal clutter (SNR) value from the base signal (control information to the mobile station system at the base station It is important to receive the downlink (or forward) received by the base station. In particular, the instructions issued by the mobile station are as follows. One reason is to adapt the station to the link point of the mobile station, where one or two words are spoken. The path of the base station should be close to one of the base stations for reasons of attenuation from these phases. In addition, the action place is caused by the signal-to-interference ratio. In order to reduce the unnecessary interference between the units in order to achieve special quality, Quasi-fixed to a constant quality, which interferes most of the time. This kind of interference will reduce the increase or decrease of its transmitter (open loop transmit power control) or other appropriate measures), and the base station transmit power (-closed circuit) Loop power control), the ultimate goal is to control the power within a relatively small tolerance, that is, 1 dB, that is, there are mobile stations transmitting within this range. Radio power control for transmission from base station to mobile station The base station transmits power control messages based on the downlink or changes its transmission power. The principle of power control in the downlink is that the loss of a channel and the phase of a single channel can be very large and the minimum is not necessary. The fact that the chain power is low and the radiation is not necessary may not be the same as the adjacent units. The action of Yuan Yuan is located in a number of disturbances. Good base station. In order to improve the standards, the guaranteed rate will be the meta-capacity and the power will be good. The road is not disturbed much by this station. Transmitting and changing disturbances can be proved in the Pacific Bureau. When ensuring that this path loss position is affected by the path, the chain power chain function is used to avoid failures. Because the consumption of the above accessible location positions is almost the same, the total interference interference increases. In the hope of strong confidence, the power control level is too high. If the situation is caused by the situation, an example from the base is a signal that is one times the number of times of interference with the action and reaches the other 7¾ of the mobile station system. * It is the least necessary for the lowest chain work. , The same platform is in phase. Another reason is that the uniformity may result in the lowest value of the product.

O: \ 56 \ 56102.pt; page 8 corrections 448 641, (y 'L ffft 88100328' month less i a_correction'_ ^ IFWEWTC ~~ reduce the degree of possible interference to other signals. Because of the power in the CDMA system The control is very important, and the adjustment of the transmission power control is extremely frequent, that is, it occurs once every 0.625 milliseconds. In adjusting the downlink transmission power, the mobile station continuously measures the transmission power level received from the base station, and decides to measure Is the value higher than the reference value? If so, one or more transmit power control bits with a value are transmitted from the mobile station's on-chain to the base station to reduce the transmit power by a predetermined increment, that is, 1 dB below the maximum transmit power In other words, when the measured value is lower than the reference value, one or more opposite values transmit power control bits are transmitted on the chain to the base station to increase the transmit power by a predetermined increment, that is, ldB is higher than the maximum value. This transmit power control It starts when the uplink and downlink synchronization have been obtained and continues throughout the communication. In diversity exchange, the coordination of the downlink transmission power level will cause problems. That is, during the handover, from the mobile station to the handover related Base The transmit power command of the base station may receive errors at one or more base stations. Another problem is that the deviation between the transmit power of the base station's downlink may be large in soft delivery. The deviation refers to the current serving mobile station. The difference between the transmit power level of one or more base stations and the power level of the new base station participating in the diversity handover of the mobile station. The deviation may be ideal for a particular application, but it may also be not ideal. When the base station starts to transmit, it is not easy to know the transmission power level of the old base station. Because the transmission power is adjusted very fast, that is, 16 times per ten milliseconds, the transmission power level has been determined and the PC instruction has been taken into account. When transmitting to a new / target base station, the actual transmission power of one or more of the serving mobile stations changes a lot in time delay. Consider the following idea. At the beginning of soft handover, from the serving base station and the target base The transmission power level measurement of the station is sent to the network node. The network node

O: \ 56 \ 56102.pt; Page 9 448642 88100328 / month M} Rev. 5 'Invention Description (5) Periodically read out the power setting and set the power set to the target base and other transmit power measurements, and for the target base station Decide on an appropriate ... ideal power with the same power or a special deviation, and then decide the platform. Click to receive. At that one hundred or so, the time from microseconds to one second to be sent to the target base station has passed. The power level may have changed to a speed of every 0.625 milliseconds | the power of the command and the actual reception and transmission at the target base station. The original position of the base station can be sent at the base of the base command, and the original position of the base station has a large deviation, that is, a method is required to compensate for the deviation of the radio power in the long run. Also, make the action desk. Inventory of the invention Coordinates the diversity of the invention and the standard of the invention. The transmission of the base and the base are eliminated. When transmitting only a set of power control-determined transmit power to the above station, the service base station is 1,000 times a second during the 100 second. Due to the transmission power adjustment, the target base station decides to transmit after and after the power delay between command times. The answer to the problem of the unfavorable base station at the time of delivery should be simple. One of the objectives of making instructions to all participants in the delivery is to overcome the technology, and it will not be another purpose to pass the base station to another transfer. . For example, the above-mentioned problems are controlled by more or less transmit power levels that are not controlled by the power of the present invention by the uplink on the base station, and the initial transmit power levels are added to the above-mentioned problems, especially providing base station functions to increase the complexity of the mobile station. In addition to incorrect transmission power settings, this includes non-ideal deviation transmission power settings. The compensation for the transmission between the participating base stations is due to the mobile station transmitting different error rates on the same downlink power control channel. Each base power level, depending on the bit error rate method, can synchronize the new target base station that is currently serving the mobile station's newly added diversity handover. At the beginning of the delivery, the radio network

O: \ 56 \ 56102.ptc Page 10 11 places Wl 箩 448 448 642, 88100328 ^ jc year / month 〆 _ ^ V. Description of the invention (6) The road controller instructs the service base station to detect its action. Individual transmission power of the station. Each serving base station reports its transmit power to the radio network controller (to the mobile station). The radio network controller determines an original transmit power setting for the target base station and determines a new transmit power for the serving base station synchronized with the special time (tQ). The original and new transmit power and synchronization time are provided to the base stations participating in the soft handover. The target base station transmits to the mobile station at the original power setting, and the serving base station adjusts its transmission power to the new value. In a specific example of a better example, the power adjustment of the serving base station and the target base station transmitting at the original power setting and the serving base station adjusting the transmission power to a new value at the synchronization time tQ are gradually performed. In another exemplary embodiment, the future synchronization time can be used and provided to all base stations to coordinate the transmission power level and reach the desired value at the synchronization time. The invention can also be used to periodically adjust the transmission power level of a previously coordinated base station. In addition, the present invention can also be used to control the transmission power levels of different base station portions participating in softer handovers. The above-mentioned objects, characteristics and advantages of the present invention will be demonstrated from the following description of the preferred specific examples accompanying the drawings. The reference characters in the drawings refer to the same parts in different figures. The illustrations are not to scale, with emphasis on the principles of the invention. FIG. 1 is a schematic diagram of an example of using the mobile cell communication system of the present invention; FIG. 2 is a functional block diagram showing the radio network controller and the base station in FIG. 1 in detail; FIG. 3 is a functional block diagram in detail. Mobile stations and participating actions in 1

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448642 t 88100328, ^ a_gvi_ V. Description of the invention (7) Power control instructions for the station, two base stations, and a radio network controller; Figure 4 is a diagram, which is displayed between the radio network controller and the base station Message transmission to synchronize the base station transmit power at the time of soft handover of a specific example of the present invention; FIG. 5 is a flowchart illustrating another procedure of base station transmit power control; and FIG. 6 is a flowchart illustrating A preferred embodiment of the present invention is a procedure for adjusting the power of the base station to the latest transmit power command received from the radio network controller. Detailed description of the drawings In the following description, for the purpose of explanation rather than limitation, special specific examples, data flow, and special details of technology are described in order to provide a thorough understanding of the present invention. However, it will be understood by those skilled in the art that the present invention may be implemented in other specific examples, which may differ from these details. For example, the present invention can be used in other delivery situations, such as "softer" diversity base station antenna part delivery, for the purpose of explanation only. The following description is about soft delivery. In other examples, the well-known method, interface The detailed description of the device and the signal technology have been omitted so as not to cause confusion in the description of the present invention. Figure 1 illustrates a mobile radio cell communication system 10. According to a preferred embodiment of the present invention, it is a CDMA or broadband CDMA communication system. The radio network controller (RNC s) 1 2 and 1 4 control various radio network functions including radio / wireless proximity holder establishment, diversity handover, etc. The radio network controller 12 is coupled to many base stations 16 , 18 and 20. The radio network controller 14 is connected to the base stations 22, 24 and 26. Each base station serves a geographical area called a unit, which can be divided into many parts. The base station 26 shows six antennas

102.ptc Page 12 448642

Description of the invention σ | ^ ^ 7J S 1-S 6, this% base station is connected to its corresponding radio network Wyvm road, microwave fi i via a dedicated ^ link, by one or more mobile switching centers (MSCS) (not shown) Connected to rV c week Λ,: Λ total exchange telephone network (pstn), and the international network # «RNC transmits mobile station calls via a suitable base station. $ 圊 1 中 'shows two mobile stations 28 and communication with i-platforms 16, 18, and 20, and mobile stations 30 and base stations 20 and 22 m. Network control devices 12 and 4 can be reached / Changeable communication from mobile station 30 via base station 20 and ". Each radio communication channel has an uplink component and a downlink component between the mobile station and the base station. As mentioned above, because multiple communications use the same radio frequency used in CMA communications, spreading codes and other well-known technologies are used to distinguish between different mobile station base station communications. Β is an illustrative example. In a specific example, the term channel refers to a CDMA channel 'for any mobile station and &' the channel is limited to a radio frequency and a special code sequence. Figure 2 provides a detailed description of a base station and a radio network controller Each radio network controller (rNc) includes a network interface 52 and various base station communication interfaces. In the RNC, the network interface 52 is connected to the controller 50 and to the diversity handover unit (DHO) 54. Diversity The handover unit 54 performs various functions, such as establishing, maintaining, and disengaging diversity connections such as diversity combination 'diversity splitting' power control and other links such as radio resource control algorithms. These D HO functions will be described in more detail later. Each base station includes a corresponding network interface interface. In addition, the 'base station includes a controller 62 connected to a number of transceivers (TRX) 64, 66, 68, and 70' and a transmit power control Is γ2. The controller 62 controls group

O: \ 56 \ 56102.ptc Page 13 Yu Wuyue 丨 said 4 48 6¾ / 88100328 7 ϋ year / month Shaoyou day __ 5. Description of the invention (9) Full operation and establishment of the platform, maintenance and cancellation of radio connection. The representative transceivers 6 4-70 are specific communications for individual commands and mobile stations. At least one transceiver is used as a common control channel on which the base station transmits a common signal such as a guide signal. The common channel is monitored by a mobile station in or near the base station unit, and is also used to request a working channel (uplink) or to call a mobile station (downlink). The transmit power controller 72 executes the open loop and closed loop power control procedures, as described in the background section above, to control the transmit power transmitted by the base station from the mobile station, at about the same power level, assuming all mobile stations Both use the same services. One advantage of CDM A communication is the use of diversity (soft and slightly soft) handovers. When using soft handover, when a mobile station moves to the boundary of the current base station unit, the mobile station can detect the common channel signal (and the guidance signal or perch signal) and determine whether the common signal is strong enough to be the target base station ( BS 2) for delivery. The mobile station sends a power measurement message to the serving base station (B S 1). The base station then sends a handover application message to R N C. This R N C accepts the submission application and sends an application for reception between base stations to the target base station. The target base station assigns a call related to the mobile station to a transceiver, and the serving base station continues to process the call. This R N C combines the connections from the two base stations, and the handover can be performed without interruption, that is, soft handover. The process of connecting a call from the interruption of two or more base stations occurs until the mobile station moves near the base station, or leaves a base station and moves to a further base station, as described in the background, to the fast Power control, diversity handover has some difficulties in coordinating / synchronizing the base stations / parts involved. Refer to FIG. 3 to understand more about the downlink power control synchronization problem in soft handover. Although multiple RNCs may participate in a diversity handover, base stations 20 and 22 shown in Figure 1

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The following description has been simplified for t = 3◦ between m and m. The purpose is to explain only one idea, which only includes that two base stations BS1 and B $ 2 are connected to the same RNC in the diversity handover. As described above, the present invention can also be applied to softer handover between base station parts. If each part involved in the softer delivery belongs to the same base station, the RNC does not need to participate in the coordination of the downlink power control provided by the base station. The mobile station includes a controller 80 connected to a RAKE receiver 82, a transmission power controller 88, and a transmitter 90. The RAKE receiver 82 includes a plurality of receivers 84 and 85 (possibly more receivers) connected to a multivariable combiner 86. The transmissions from the two base stations BS1 and BS2 are received by the multi-paths of the receivers 84 and 85, combined in a multi-change combiner 86, and processed with one signal. The transmit power controller 88 detects the power level as the signal-to-interference ratio Eb / I of the received diversity combined signal. . The transmission power controller 88 of the mobile station also responds to the uplink transmission power from the base stations BS1 and BS2 to adjust its uplink transmission power to increase or decrease by an appropriate increment according to the received command. In the quasi-measurement, the controller 80 generates a transmit power control (TP C) instruction and transmits it to the serving base station bs 1 and the target base station BS2 via the transmitter 90. According to a preferred embodiment of the present invention, the TPC instruction includes one or more bits indicating an ideal increase in transmit power, an ideal decrease, and no change in transmit power. "Of course, any number of bits or bit designations may be used, and by the present invention The proposed. According to the received TPC instruction, BS1 and BS2 increase or decrease their power in corresponding increments / that is, 0_5 or ldB. As mentioned above, the above are the main problems when trying to coordinate the current transmission power level of the serving base station B S 1 when setting the original power level in the soft handover of the new target base station. The main thing is that when the RNC process comes from the serving base station BS1

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V. Description of the invention (11) 448642 88100328 Years ^ > ^ said to amend the message to the mobile station, the base station BS 2 during the development of the original power settings, the serving base station BS 1 must adjust its transmit power many times in response to the number received during this period The " fast NTPC instruction. As a result, when the target base station BS 2 starts transmitting, there may be a great deviation between the service and the transmission power level of the target base station. Since the known power level is different from the expected pre-established deviation, in the preferred embodiment, the power transmitted by the target and service base stations is close to equal power levels. An example of the former, where the mobile station is quite close to the first base station and is farther away from the second base station does not cause the farther base station to transmit at a very high power level, and the power level of the second base station measured by the mobile station For the same, interference can be reduced and the capacity can be increased by keeping the power level of the second base station lower than the power level of the first base station. In any case, it is ideal to have the serving and target base stations transmit at a known power level or a known relative level difference, that is, the absolute power level must be known at each instant in time. The present invention achieves this ideal goal by using a transmit power synchronization procedure. Generally, the power levels of all base stations related to diversity handover are set at a specific time, or at one or more predetermined levels at a specific time. The transmission power synchronization procedure can be divided into five stages, including: (1) When the target base station starts transmitting to the mobile station with the ideal power setting and ideal power level, the transmission power time is determined according to the mobile station power report (t .); (2) Notify the new target base station of the ideal power setting and transmit power synchronization time (tQ); (3) Notify the old serving base station and the target base station of this ideal power setting

O: \ 56 \ 56102.ptc Page 16 448 642 Amendment! 8100328 V. Description of the invention (12) and #Radio power synchronization time (t.); (4) Check power level at synchronization time (tG); and (5) Adjust the transmission power of the serving base station. Each serving base station can also adjust its transmit power based on the ideal power setting of the new target base station and the difference in the transmit power synchronization time. The above procedure is changed to provide synchronization time tfl to all base stations participating in the handover. Each base station can adjust its respective transmit power to become the ideal level at the synchronization time ta. The above procedure can also be used to initially synchronize to compensate for any " drift M " in the transmit power level. As mentioned above, this drift occurs because the error bit of a TPL command received by a base station that affects the transmit power level (TPL) command is not the same as the bit error of a TPL command sent to a second base station that affects the same the same. This causes M different TPL instructions instead of the same TPL instruction that produces a drifting transmit power level. Figure 4 illustrates the procedures performed by the radio network controller and the base stations participating in the soft handover to achieve base station power synchronization according to a preferred embodiment of the present invention. First, the radio network controller commands each serving base station BS1, BS2, ••• BSn to measure their respective transmission power levels to the mobile stations FV P2 ~ Pn and to report the measurement results to N R C (Segment 100). Each serving base station measures its respective transmit power P], P2, ... Pn (or in the form of Eb / I. Values) and reports the respective average transmit power to R N C (Segment 102). As a result, the radio network controller decides for the target base station BSnew that the initial transmission power (P_) will be transmitted at the transmission power synchronization time in the future (tfl). The radio network controller is also the serving base station BSp BS2 " 'BS. It is decided that the new transmission power settings P ,, P2, ... Pn at time (tQ) (Segment 1 0 4). As above

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448642 8100328 ^ 0 Amendment Year / Month X1 Day 5. In the description of the invention (13), in the specific example of the better example, the original target power setting and the new power setting of the serving base station are the same. At the synchronization time (t.), The target base station B S new sets SPn-ew to transmit at the original power. In addition, the serving base stations BS1, BS2 ... BSn adjust their transmission power at the synchronization time (tQ) from their current transmission power values P !, P2 ... Pn to the synchronization time (t 〇) (Segment 106) new power setting. The power control operations are not performed by the radio network controller, and these power control operations may be performed by the respective base stations. Another procedure is explained in conjunction with FIG. 5. The base station is not allowed to measure and transmit power to the mobile station. The mobile station measures the power received from each base station and sends the received power to the RNC. The RNC then determines one or more control deviations between the new transmit power Pnew and synchronization time te of the new base station BSnew and the old base station BST new power Pnew and old power PQldi participating in the soft handover (Segment 1 110). (offset, corresponding to BSi) «The RNC then sends P_ and P to the new base station BSnew, and Pnew, tfl and of f set to each old base station BSJ segment 1 1 2). At time tQ, each old base station BS detects its transmit power P. ^ And Calculate the incremental value △ of f seti + Pow-P ^ (paragraph 1 14). Each old base station then adjusts its transmit power to increase or decrease Δi (Segment 1 1 6). There are several different ways. Among them, the difference between the old and new power settings of the serving base station can be minimized by adjusting the ideal deviation, and this adjustment is preferably made gradually (though not necessarily). Gradual renaming preferably occurs when power increases, especially when transmitting at high bit rates. This will minimize interference with the rest of the system. The preferred method for adjusting the power of the serving base station is explained with the routine service base station power adjustment (Segment 2 0 0) explained in the flow chart format in FIG. 6.

O: \ 56 \ 56102.pic Page 18 A48 642 81QQ328 M > Modification V. Description of Invention (14) The current power of each serving base station is represented by P (tQ), and the new transmission at (tfl) is synchronized Represented by P (ta). A variable α is limited to the absolute value of the difference between the current and new power settings, that is, a P (t0) -P (tn) This difference is preferably reduced to zero (or to the ideal deviation). At this time, the service and The target base stations are synchronized, meaning that they transmit to the mobile station at about the same power level (or an ideal deviation) and at the same time. The value of the parameter is set in section 102 according to the rate at which the difference decreases. Two different values can be used: β up and β .down ° In section 204, it is determined whether the power difference intensity α is zero or close to zero, that is, within the deadband range. If so, a decision is made that the transmit power synchronization between the target and the serving base station (Segment 2 12) has been reached. Otherwise, a decision is made in paragraph 206 whether the current base station transmit power at the synchronization time (tQ) is greater than the ideal power setting for that time. If not, the transmit power from the base station is gradually increased. The transmit power is not increased at every possible power adjustment opportunity, that is, when each fast TPC instruction is received, the power is only increased at the selected opportunity or period. In particular, the power is increased only after the α / 10,000 transmit power control command is ignored. The increase in transmit power increases, with an example α // 5 value in the range of dB. Alternatively, if the current transmission power is less than the ideal power at that time, the power transmitted by the base station to the mobile station is reduced by an appropriate power adjustment increment at every / 3 // 3 instruction (paragraph 210). The appropriate α / call value of the rate of power reduction in section 210 is preferably selected. The power reduction is faster than the power increase, that is, the power reduction is performed in one step. Control returns from segment 208 or segment 2 10 to decision segment 204 to determine whether power synchronization has been reached, or repeat the above adjustments.

O: \ 56 \ 56102.ptc Page 19 448 64 2 '$ 1 ^^ 58100328 > Year / Month > Name Amendment 5. Method of Invention (15). Ignoring each α / call power adjustment instruction, the present invention can ensure that the power is gradually increased or decreased, and at the same time, any undesired power level difference is minimized. -Therefore, the present invention can achieve base station power synchronization during diversity handover without increasing the complexity of the mobile station. In addition, the mobile station only needs to transmit a set of power control instructions to all base stations / base station segments that it communicates with. The present invention can be applied to participate in the diversity handover and the initial power setting in the diversity handover procedure to compensate for the drift of the transmission power level. Since this dynamic and coordinated downlink power control is provided, unnecessary interference due to high base station transmissions can be minimized, but the minimum power communication can still be maintained. This can improve the performance of the downlink system and the capacity related to the relative transmit power level on the downlink. Therefore, the present invention is also described with the most practical and preferred specific examples that are currently considered. I understand that the present invention is not limited to the disclosure of specific examples. On the contrary, it can cover different modifications and equivalent arrangements within the scope of the patent application of the present invention. As described above, the present invention has described soft delivery, and the present invention can also be applied to other delivery situations including softer delivery.

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Claims (1)

No. 448642 No. 881QQ328 Patent Application Month Amendment The system includes the following steps in the base station phase method involving the transmission to the mobile station 1. A power control method for a mobile radio communication system, the controller is connected to multiple base stations Each base station talks to a mobile station in or near the geographic area. This step: The call of the mobile station is from the first base station at a first power level and one mobile station and the first base station. Establish initial communication between stations; establish a handover communication between the mobile station and the second base station for the same call; determine the initial second power level for the second base station to transmit from the second base station to the mobile Station; and to the ideal launch 2. If applying for zero. 3. If applied for zero. 4. If the application is for self-action of the platform (diversity received signals are together. 5. If the application gradually changes the control of the transmission power level of one of the first base station and the second base station to achieve a power deviation. The first scope of the patent scope Method, wherein the ideal deviation is the method of the first range of patents, wherein the ideal deviation is the method of the first range of non-patent scopes, wherein the signals received by the first and second base stations are combined in a diversity in the controller -combined ), And the mobile station from the first and second base stations to the Rake receiver in the mobile station to collect the method of the patent scope of the first method, the control steps also include: the first and second base stations To reduce the transmit power level O: \ 56 \ 56102.ptc Page 22 448642 88100328 Amendments to the scope of patent applications, including item 11 of the French method in step control. Please send it as soon as possible. The rate of work is the same as that of the standard rate of work. Have you ever thought about the accuracy of power adjustment during the adjustment of the position? 1 | ii The second and surrounding Fan Jianli Taiwan specifically asked Jishen to continue the decision of the French side in the decision-making process. Xiang Fang's achievements from the beginning of the 7th round of the platform β ground niche, the second request, and the quasi-station position to the left of the standard include the step-by-step control method ο t time and the level rate. The difference between the real time and the real time is too high. The base rate of the French side of the law is 8. I think the range of the first rule to the Taiwanese special time base is decided in one application. 3. Thoughts on level rate power launch? · 1 Principles and practical implementation of the platform are still based on the first step of the first control, the ratio rate rate is based on the first rate? The bit rate rate and power rate are actually low in real time. For example, the quasi and bit rate rate are based on the foundation of the mouth \ Article Yu '• 第 ο The quasi-level rate rate and power rate are actually increased. For example, the right amount of increase in the amount of mouth and one base each time and its delay during the period * ί the third party between the terms of the increase-incremental increase-each time the rate of success in real estate Fan Li special application If you lower the price, you can apply for the following: 包包 的 发 发 厶 0 Foundation 2nd-In ο Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ Ϊ 作 作 作 作 间 间 间 间 范 范 范 Fan Li specially asked to lead the work of thought gL ίι Is it not saved? Between 厶 〇 foundation two and one and one, in Chad Summary level O: \ 56 \ 56102.ptc G range on page 23 ^ ~~ 4 48 6 4 2 88 100 328 ^ year / month _ ^ Control the transmit power levels of the first and second base stations to reduce undesired emissions Power level deviation. 1 2. A mobile communication-system * includes: a mobile radio station; a first base station that establishes communication between the first base station and the mobile station transmitting to the mobile station at the first power level; a second base station To establish communication with the mobile station; and a base station controller connected to the first and second base stations, set a raw power level for the second base station to transmit to the mobile station, and adjust the first base station to the mobile station Transmit power level, and set the initial power level of the second base station. 13 3. The system according to item 12 of the scope of patent application, wherein the base station controller includes a diversity delivery unit for diversity corresponding to a signal received from the mobile station from the first and second base stations. Combined. -1 4. The system according to item 12 of the patent application range, wherein the transmission power level of the first base station is adjusted to the original power level set by the second base station. 1 5. The system according to item 12 of the scope of patent application, wherein the transmission power level of the first base station is adjusted to the ideal deviation from the original power level set by the second base station. 16. The system according to item 12 of the patent application scope, wherein each of the first and second base stations includes a transmission power controller to change the power transmission level of the base station to the mobile station. 1 7. The system according to item 16 of the scope of patent application, wherein the transmit power controller of one of the first and second base stations changes its base station transmit power in response to O: \ 56 \ 56102.ptc Page 24 Fang Yuanyuan month η 1S 448642 88100328 / Revision VI. Patent application scope Transmit power level control signal of base station controller 〇18. For example, apply for profit range 1 2 The system of this item causes the mobile station to include: a RAKE receiver combining the signals received by the mobile station from the first and second base stations as a combination of variability to generate a variable combination of received signals, and a mobile station controller ， Measuring the variable parameters combined with the received signals, and transmitting to the first and second base stations-the transmit power level control command to increase or decrease the transmit power according to the measured parameters 0 19 The system of item 12 enables the base station's transmit power level to be adjusted to reduce the difference between the original second transmit power and the first transmit power level by 0 2 0. If the scope of the patent application is No. 1 2 Item system, in which the first and second bases The station-based transmit power level is gradually changed. 2 1. The system according to item 12 of the patent application scope, wherein the base station controller establishes a predetermined synchronization time (tQ) for the first and second base stations related to the ideal power transmission level. 2 2. If the system of the scope of patent application No. 2I, wherein the first base station determines the actual power transmission level of the first base station at the synchronization time ta and the ideal transmission power level of the first base station at the synchronization time% And adjust the transmit power level of the first base station to reduce this difference. 2 3. A method including coordinating the transmission power level of the serving base station to the mobile station with the original transmission power level of the target base station that was transmitted to the mobile station during the handover operation. 2 4. The method according to item 23 of the scope of patent application is used in a CDMA mobile communication system, where the handover operation is a diversity handover operation. 0: \ 56V56l02.ptc Page 25 4 3 6 4 * 2 Amendment number 88100328 / month a \, patent application scope 25. For the method of patent application scope No. 23, including the original power level of the target base station, and the number of service base stations Individual transmit power levels are coordinated. 26. The method according to item 23 of the scope of patent application, wherein, based on the original power level of the target base station, a new transmit power level is determined for the serving base station. The original and new transmit power levels and the predetermined synchronization time are provided to Services and target base stations. 27. The method according to item 26 of the patent application scope further includes adjusting the transmit power at least at the serving base station to reduce the difference between the actual transmit power level and the new transmit power level at a predetermined synchronization time. 28. The method according to item 27 of the scope of patent application, wherein the reduction is implemented gradually. 29. The method according to item 26 of the patent application scope further includes adjusting the transmission power level at least at one or all services and target base stations to reduce the actual transmission power level and the new or original transmission power level at a predetermined time. The difference between standards. 30. — A power control method for a mobile radio communication system, including a controller connected to multiple base stations, each base station talking to a mobile station located in or near a geographic area associated with the base station, and having a number of The district has one or more antennas. The method includes the following steps: For a call involving a mobile station, an original call is established between the mobile station and the first district at a first power level. Launch by mobile station; Establish handover communication between mobile station and second district department for the same call; lilli O: \ 56 \ 56102.ptc Page 26 ^ Daddy 4 4 8 6 4 2 t ΓΓ 88100328 9b year / month > ^ a__ ι 6. Apply for a patent to determine an original second power for the second district Level to transmit from the second zone to the mobile station; and control the transmission power levels of the first and second zones to achieve the desired transmit power deviation. 31. The method of claim 30, wherein the ideal deviation is approximately zero. 32. The method of claim 30 in the scope of patent application, wherein the control step further comprises: gradually changing the transmission power level of one of the first and second zones to reduce the difference therebetween. 3 3. The method of claim 30 in the scope of patent application, wherein the control step includes: adjusting the actual transmit power levels of the first and second zones to the same level. 3 4. The method according to item 30 of the scope of patent application, wherein the determining step further includes: establishing a predetermined time (ta) related to the ideal transmit power level for the initial power levels of the first and second zones Use. 35. If the method of claim 34 in the scope of patent application, the control steps still include: determining the difference between the actual transmit power level of the first zone at time tfl and the ideal transmit power level of the first zone at time% . 36. The method according to item 35 of the patent application, wherein if the difference exceeds the threshold, the control steps further include:-comparing the actual and ideal transmit power levels of the first zone; if the actual transmit power level exceeds the first zone Ideal transmit power level, reducing the actual power level in the first zone; and O: \ 56 \ 56102.ptc Page 27d 48 64 No. 88100328 Amended patent application scope If the actual transmit power level is less than or equal to the ideal transmit power level of the first zone, increase the actual value of the first zone Power level. 0: \ 56 \ 56102.pic Page 28