CN101472291A - Method for adaptively transmitting channel quality indication and mobile unit using the same - Google Patents

Abstract

The present invention provides a method for adaptively transmitting a channel quality indication from a mobile unit to a base station. First, the method determines a current channel quality indication. Next, the method transmits a packet from the base station to the mobile unit and detects whether the packet is correctly received. Thereafter, the method compares the current channel quality indication with a previous channel quality indication. Finally, the method determines whether to transmit the current channel quality indication to the base station based on the above detection result and comparison result.

Description

Method for adaptively transmitting channel quality indication and mobile unit using the method

technical field

The present invention relates to a mobile unit, and in particular, to a method of adaptively transmitting a channel quality indication and a mobile unit applying the method.

Background technique

In recent years, due to the rapid development of mobile communication technology, many new mobile communication functions have been launched in the market one after another. For example, in the third generation mobile communication (3G) system, the data access of the wireless Internet is one of its main application items. The characteristics of the data traffic of the wireless Internet are asymmetric, that is to say, most of the data transmission of the wireless Internet is downlinked from the wireless Internet to a user equipment (UE). In comparison, the proportion of data transmission uploaded by the user equipment to the wireless Internet is quite small.

In order to comply with the downlink-based characteristics and improve the data transmission speed of the mobile communication system, the third and fifth generation mobile communication (3.5G) using the High Speed Downlink Packet Access (HSDPA) protocol technology is thus proposed. Without changing the existing WidebandCode Division Multiple Access (WCDMA) network architecture, this technology can increase the downlink packet transmission speed of the Universal Mobile Telephone System (UMTS) That boosts to 14.4Mbps.

According to the current HSDPA specification, each user equipment must measure the downlink channel quality between itself and the base station, and select an appropriate channel quality indicator (Channel Quality Indicator, CQI) accordingly. The CQI can be used to represent the quality of the transmission channel between the UE and the base station.

Through a high speed physical downlink shared transmission channel (High Speed Physical Downlink Shared channel, HS-PDSCH), the user equipment can periodically report the above CQI to the base station. If the period for the user equipment to report the CQI is shorter (that is, the number of times the CQI is reported more frequently), the base station can more accurately estimate the state of the downlink channel between the user equipment and the base station, and then appropriately adjust the transmission of downlink data. set up.

However, if the number of times that the user equipment reports the CQI is too frequent, it may not be helpful to the mobile communication system. This is because if the CQI is reported too many times, it may cause interference to the uplink transmission of data between the UE and the base station. Especially when the channel state between the UE and the base station gradually tends to be stable, that is, when the CQI value of the channel remains almost unchanged, if the UE continues to periodically report the The CQI, on the contrary, will cause considerable waste of the electric power of the user equipment.

In order to solve the above problems, many solutions have been proposed at present. Some existing technologies use an activity-based rather than a fixed-period based reward mechanism. For example, some user equipments transmit CQI every time they transmit acknowledgment (ACK) and negative acknowledgment (NACK) information, and some user equipments always transmit CQI every time they transmit negative acknowledgment (NACK) information . A disadvantage of this type of prior art is that it is rather power intensive.

On the other hand, there is an existing technology that reports the CQI only when the change of the CQI is greater than a certain threshold. In other words, only when the new CQI is very different from the previously reported CQI, the UE will report the new CQI to the base station. This technology can indeed significantly reduce the number of CQI value reports. However, the biggest disadvantage of this method is that the base station does not adjust its transmission settings in real time according to the possibly changing CQI. The base station may have been using the wrong CQI until it receives a new CQI.

Based on the above, the existing technologies each have some shortcomings, and none of them can provide a perfect solution. Therefore, the main purpose of the present invention is to provide a method for adaptively transmitting CQI and a mobile unit using the method, so as to solve the above problems.

Contents of the invention

According to an embodiment of the present invention, it relates to a method for adaptively transmitting a channel quality indication from a mobile unit to a base station. First, the method determines the current channel quality indication. Next, the method transmits a packet from the base station to the mobile unit via at least one channel, and checks whether the packet is received correctly. Thereafter, the method compares the current channel quality indication with a previous channel quality indication. Finally, the method determines whether to transmit the current channel quality indicator to the base station according to the above detection result and comparison result.

The method according to the present invention, which includes: if the packet received by the mobile unit is correct and the current CQI is greater than the previous CQI, increasing the first count and replacing the previous CQI with the current CQI; and if increasing After the first count is equal to the first critical value, the current channel quality indicator is sent to the base station.

The method according to the present invention includes: if the packet received by the mobile unit is correct and the current CQI is smaller than the previous CQI, decreasing the first count.

According to the method of the present invention, it includes: if the packet received by the mobile unit is correct and the current CQI is equal to the previous CQI, judging whether the current CQI is equal to the maximum value; and if the current CQI is smaller than the maximum value, The first count is maintained.

According to the method of the present invention, it further includes: if the current channel quality indicator is equal to the maximum value, increasing the first count; judging whether the increased first count is equal to the first critical value; and if the increased first count is equal to the first critical value value, and transmit the current channel quality indicator to the base station.

According to the method of the present invention, it includes: if the packet received by the mobile unit is incorrect and the current CQI is smaller than the previous CQI, increasing the second count and replacing the previous CQI with the current CQI; whether the second count is equal to a second critical value; and if the increased second count is equal to the second critical value, sending the current channel quality indicator and negative acknowledgment (NACK) information to the base station.

The method according to the present invention includes: if the packet received by the mobile unit is incorrect and the current CQI is greater than the previous CQI, decreasing the second count and deciding not to send the current CQI to the base station.

The method according to the present invention includes: if the packet received by the mobile unit is incorrect and the current CQI is equal to the previous CQI, maintaining the previous CQI.

According to the method of the present invention, wherein the packet is transmitted to the mobile unit through at least one channel, and in determining the current channel quality indicator, the current channel quality indicator is periodically generated by evaluating the at least one channel.

According to another specific embodiment of the present invention a mobile unit. The mobile unit includes a transceiver, an evaluation module, a judgment module and a comparison module. The transceiver is used for receiving packets from the base station through at least one channel. The evaluation module is used for evaluating the at least one channel to generate a current channel quality indicator. The judging module is used for judging whether the packet received by the transceiver is correct. The comparison module is used for comparing the current CQI with the previous CQI. The transceiver decides whether to transmit the current channel quality indicator to the base station according to the judgment result of the judgment module and the comparison result of the comparison module.

According to the mobile unit of the present invention, wherein the transceiver includes: a first counter, if the packet received by the transceiver is correct and the current channel quality indicator is greater than the previous channel quality indicator, the first counter increases the first count and uses the current channel quality indicator Replace the previous channel quality indication; the first judging unit is used to judge whether the increased first count is equal to the first critical value; and the determining unit, if the increased first count is equal to the first critical value, the determining unit decides to transmit the current channel Quality indication to the base station.

According to the mobile unit of the present invention, wherein the transceiver includes: a first counter, if the packet received by the transceiver is correct and the current channel quality indicator is smaller than the previous channel quality indicator, the first counter decreases the first count; and the decision unit, if The packet received by the mobile unit is correct and the current CQI is smaller than the previous CQI, the determining unit decides not to send the current CQI to the base station.

According to the mobile unit of the present invention, wherein the transceiver includes: a second judging unit, if the packet received by the transceiver is correct and the current CQI is equal to the previous CQI, the second judging unit judges whether the current CQI is equal to the maximum value; a first counter, if the current channel quality indicator is less than the maximum value, the first counter maintains the first count; and a decision unit, if the current channel quality indicator is less than the maximum value, the decision unit decides not to transmit the current channel quality indicator to the base station.

According to the mobile unit of the present invention, if the current channel quality indicator is equal to the maximum value, the first counter increases the first count, and the transceiver further includes: a first judging unit, used to judge whether the increased first count is equal to the first threshold value, if the incremented first count is equal to the first critical value, the determining unit decides to send the current channel quality indicator to the base station.

According to the mobile unit of the present invention, wherein the transceiver includes: a second counter, if the packet received by the transceiver is incorrect and the current channel quality indicator is smaller than the previous channel quality indicator, the second counter increases the second count and uses the current channel quality The indication replaces the previous channel quality indication; the first judging unit is used to judge whether the increased second count is equal to the second critical value; and the determining unit, if the increased second count is equal to the second critical value, the determining unit decides to transmit the current Channel quality indication and negative acknowledgment (NACK) information to the base station.

According to the mobile unit of the present invention, wherein the transceiver includes: a second counter, if the packet received by the transceiver is incorrect and the current channel quality indicator is greater than the previous channel quality indicator, the second counter decreases the second count; and the decision unit, If the packet received by the transceiver is incorrect and the current CQI is greater than the previous CQI, the determining unit decides not to send the current CQI to the base station.

According to the mobile unit of the present invention, if the packet received by the transceiver is incorrect and the current CQI is equal to the previous CQI, the transceiver maintains the previous CQI.

In the method for adaptively transmitting the CQI and the mobile unit using the method according to the present invention, the variation of the CQI itself and the correctness of the packet are taken into consideration at the same time. Compared with the prior art, the method and the mobile unit of the present invention do not periodically or fixedly report channel quality indications when transmitting certain communication information, so excessive power consumption and unnecessary interference can be avoided. In addition, since the method and the mobile unit of the present invention also consider the correctness of the packet, it can avoid the problem of not correcting the CQI in real time in some prior art.

The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the accompanying drawings.

Description of drawings

FIG. 1 is a flowchart of a method for adaptively transmitting a channel quality indicator from a mobile unit to a base station according to a first embodiment of the present invention.

FIG. 2 is a flow chart of the method if the packet is correct in the embodiment shown in FIG. 1 .

FIG. 3 is a flow chart of the method if the packet is incorrect in the embodiment shown in FIG. 1 .

FIG. 4 is a functional block diagram of a mobile unit according to a second embodiment of the present invention.

FIG. 5 is a functional block diagram of the transceiver shown in FIG. 4 further including components 111 - 115 .

Detailed ways

According to a first embodiment of the present invention, a method for adaptively transmitting a channel quality indication from a mobile unit to a base station. Please refer to FIG. 1 , which is a flowchart of the method. As shown in Fig. 1, the method executes step S11 to determine the current channel quality indicator. On the other hand, the method executes step S12 of transmitting the packet from the base station to the mobile unit, and checking whether the packet is received correctly. After step S11, the method executes step S13, comparing the current CQI with the previous CQI. Finally, the method executes step S14, and determines whether to transmit the current channel quality indication to the base station according to the detection result of step S12 and the comparison result of step S13.

In practice, the packet is usually sent to the mobile unit through at least one channel. The current channel quality indication can be generated in the mobile unit by periodically evaluating the at least one channel. Additionally, the mobile unit can communicate with the base station via the HSDPA protocol. It should be noted that, since this method determines whether the current CQI should be sent to the base station according to whether the packet is received correctly and compares the CQI, it is quite different from the method adopted in the prior art .

In practical application, the mobile unit may use a counter realized by a circuit or a program to record the change of the channel quality indicator.

Step S14 of the method can be divided into several situations for discussion according to the detection result of step S12 and the comparison result of step S13. First, consider the situation that the detection result of step S12 is that the packet is received correctly. As shown in FIG. 2, step S140 compares the current CQI with the previous CQI, and may generate three comparison results.

The first possible situation is that if the current CQI is greater than the previous CQI, the method executes step S141 to replace the previous CQI with the current CQI. Next, the method executes step S146 to increase the first count. Afterwards, the method executes step S147 to determine whether the increased first count is equal to the first critical value. If the judging result of step S147 is yes, that is, the increased first count is equal to the first critical value, then the method executes step S142 to transmit the current channel quality indicator to the base station. If the judging result of step S147 is no, the method executes step S151, and the current channel quality indicator will not be sent to the base station.

The second possible situation is that if the current CQI is smaller than the previous CQI, then the method executes step S143 to decrease the first count. For example, step S143 may reset the counter used to count the first count to zero.

The third possible situation is that if the current CQI is equal to the previous CQI, then the method executes step S144 to judge whether the current CQI is equal to the maximum value. If the judging result of step S144 is that the current channel quality indicator is smaller than the maximum value, the method executes step S145 to maintain the first count.

On the other hand, if the judging result of step S144 is that the current channel quality indicator is equal to the maximum value, the method executes step S146 to increase the first count. Afterwards, the method executes step S147 to determine whether the increased first count is equal to the first critical value. If the judging result of step S147 is yes, that is, the increased first count is equal to the first critical value, then the method executes step S142 to transmit the current channel quality indication to the base station. If the judging result of step S147 is no, the method executes step S151, and the current channel quality indicator will not be sent to the base station.

For example, if a mobile phone communicates with a base station through the HSDPA protocol, and packets are sent from the base station to the mobile phone through multiple channels. Assuming that the packet is correctly received by the mobile phone, the method according to the present invention compares the current CQI_1 with the previous CQI_0 to determine whether to send the current CQI_1 to the base station.

When CQI_1>CQI_0, it means that the channel quality at this time is better than before. According to the present invention, if the first count C1=2 at this time, then C1 can be increased to C1'=3, and CQI_1 can be used to replace CQI_0. Then, whether the incremented first count C1' is equal to the first critical value C1 _th is judged. If C1 _th =C1'=3, that is, the increased first count C1' is equal to the first critical value, then CQI_1 will be sent to the base station.

When CQI_1=CQI_0, it means that the channel quality at this time is the same as before. According to the present invention, in this case, CQI — 1 will be judged whether it is equal to the maximum value CQI _max . If the judgment result is CQI_1<CQI _max , it means that CQI_1 has not reached the maximum value, and assuming that the first count C1=2, then C1=2 remains unchanged. If the judgment result is CQI_1=CQI _max , it means that CQI_1 has reached the maximum value, and at this time, the first count C1=2 can be increased to C1′=3. Then the incremented first count C1 ′ is also judged whether it is equal to the first critical value C1 _th . If C1 _th =C1'=3, CQI_1 will be sent to the base station.

When CQI_1<CQI_0, it means that the channel quality indicator CQI becomes smaller, that is, the channel quality becomes worse. At this time, the first count C1=2 will be reduced to C1"=1. Since the first count C1 is reduced, the first count cannot reach the first critical value C1 _th =3, that is, when CQI_1<CQI_0 In the case of , CQI_1 will not be sent to the base station.

Based on the above situations, when the received packet of the mobile phone is correct, the current channel quality indicator CQI_1 will be sent to the base station in two situations. The first case is when CQI_1>CQI_0 and the first count C1 is increased to the threshold C1 _th . Another situation is when CQI_1=CQI_0=CQI _max and the first count C1 is increased to the critical value C1 _th . The common point of these two situations is that only when the first count C1 is increased to the threshold C1 _th , the CQI_1 will be sent to the base station. In this way, the waste of power and unnecessary interference caused by too many CQI returns in the prior art can be avoided.

Next, consider the situation that the packet received by the mobile unit is incorrect, according to the comparison result of the channel quality indicator and the previous channel quality indicator, as shown in Figure 3, if the packet is incorrect, the method also first executes the steps S140. Compare the current CQI with the previous CQI, and possibly generate three comparison results.

The first possible comparison result is that if the current CQI is smaller than the previous CQI, the method executes step S141, replacing the previous CQI with the current CQI. The situation that the CQI becomes smaller but the count increases is just opposite to the situation that the count increases as the CQI becomes larger when the packet is correct. Next, the method executes step S1461 to increase the second count. Afterwards, the method executes step S1471 to determine whether the increased second count is equal to the second critical value. If the increased second count is equal to the second critical value, then the method executes step S148, sending the current channel quality indicator and negative acknowledgment (NACK) information to the base station. If the judgment result of step S1471 is no, that is, the second incremented count is smaller than the second critical value, then the method executes step S151, and does not transmit the current channel quality indicator to the base station.

The second possible comparison result is that if the current CQI is greater than the previous CQI, then the method executes step S149 to decrease the second count and decide not to transmit the current CQI to the base station. For example, the second count may be zeroed. This situation means that even if the packet is wrong, but the current channel quality is better than before, the current channel quality indicator will not be sent to the base station.

A third possible comparison result is that if the current CQI is equal to the previous CQI, since the channel quality remains unchanged, the method executes step S150 to maintain the previous CQI.

For example, if a mobile phone communicates with a base station through the HSDPA protocol, and packets are sent from the base station to the mobile phone through multiple channels. Assuming that the packet received by the mobile phone is incorrect, according to the method of the present invention, the current CQI_1 is compared with the previous CQI_0.

When CQI_1>CQI_0, because the packet is incorrect, the second count C2=2 can be reduced to C2"=1 and CQI_1 is decided not to be transmitted to the base station. This is because the second count C2 is reduced to 1, The second threshold C2 _th =3 cannot be reached, so CQI_1 will not be transmitted to the base station.

When CQI_1=CQI_0, it means that the channel quality remains unchanged. Therefore, the CQI at this time remains unchanged from the previous CQI, that is, CQI=CQI_0=CQI_1.

When CQI_1<CQI_0, since the packet is incorrect, the second count C2=2 can be increased to C2'=3 and CQI_1 can be used instead of CQI_0. Then, it is judged whether the added C2' is equal to the second critical value C2 _th . If C2 _th =C2'=3, that is, when the second count is increased to the second threshold, CQI_1 and negative acknowledgment (NACK) information will be sent to the base station.

Based on the above circumstances, when the packet received by the mobile phone is incorrect and the second count is increased to the second threshold, the current channel quality indicator will be sent to the base station. By taking the correctness of the packet into consideration, the method and the mobile unit according to the present invention can avoid some problems of the prior art that the CQI is not corrected in real time.

According to a second specific embodiment of the invention a mobile unit. Please refer to FIG. 4, which is a functional block diagram of the mobile unit. As shown in FIG. 4 , the mobile unit 10 includes a transceiver 11 , an evaluation module 12 , a judgment module 13 and a comparison module 14 . The transceiver 11 is used for receiving packets from the base station through at least one channel. The evaluation module 12 is used for evaluating the at least one channel to generate a current channel quality indicator. The judging module 13 is used for judging whether the packet received by the transceiver 11 is correct. The comparison module 14 is used for comparing the current CQI with the previous CQI. The transceiver 11 determines whether to transmit the current channel quality indicator to the base station according to the judgment result of the judgment module 13 and the comparison result of the comparison module 14 .

Please refer to FIG. 5 , which shows various possible situations of the transceiver 11 according to the second specific embodiment of the present invention. As shown in FIG. 5, if the packet received by the transceiver 11 is correct and the current channel quality indicator is greater than the previous channel quality indicator, the transceiver 11 may include a first counter 111, a first judging unit 112 and a decision unit 113. The first counter 111 is used to record the number of correct packets received by the mobile unit 10 . The first counter 111 may increment a first count and replace the previous CQI with the current CQI. The first judging unit 112 is configured to judge whether the increased first count is equal to a first critical value. If the increased first count is equal to the first threshold, the determining unit 113 determines to send the current channel quality indication to the base station. This is because the channel quality indicator becomes larger, which means that the channel quality becomes better, so the first count will be increased. When the first count is increased to a threshold, the current channel quality indicator is sent to the base station.

Similarly, as shown in FIG. 5, if the packet received by the transceiver 11 is correct and the current channel quality indicator is equal to the previous channel quality indicator, then the transceiver 11 may include a first counter 111, a second judging unit 114 and a decision unit 113 . If the current channel quality indicator is smaller than the maximum value, the first counter maintains a first count. The second judging unit 114 can judge whether the current CQI is equal to the maximum value.

What is discussed next are two possible judgment results of the second judging unit 114 . The first possible judgment result is that the judgment result of the second judging unit 114 is that the current channel quality indicator is less than the maximum value, then the first counter 111 can maintain the first count, and the decision unit 113 decides not to transmit the current channel quality indicator to the base station. This is because the CQI remains unchanged and has not yet reached the maximum value, so the first count remains unchanged.

The second possible situation is that the second judging unit 114 judges that the current channel quality indicator is equal to the maximum value, and the first counter 111 may increase the first count. Since the first count is increased, in order to determine whether the increased first count is equal to a first threshold, the transceiver 11 may further include a first determination unit 112 . If the judgment result of the first judgment unit 112 is that the increased first count is equal to the first threshold, the decision unit 113 decides to send the current channel quality indicator to the base station. This is because the CQI remains unchanged and has reached the maximum value, so the first counter 111 can increase the first count. When the first count is increased to a threshold, the current channel quality indicator can be sent to the base station.

In addition, as shown in FIG. 5 , when the packet is correct and the current CQI is smaller than the previous CQI, the transceiver 11 may include a first counter 111 and a decision unit 113 . Since the channel quality indicator becomes smaller, the first counter 111 decreases the first count. The decision unit 113 decides not to send the current channel quality indicator to the base station.

In addition to the above three possible situations in which the packet received by the transceiver 11 is correct, FIG. 5 also shows three possible situations in which the packet is incorrect. The first possibility is that if the CQI is smaller than the previous CQI, the transceiver 11 may include a second counter 115 , a first judging unit 112 and a decision unit 113 . The second counter 115 can increment a second count and replace the previous CQI with the current CQI. The first judging unit 112 is configured to judge whether the increased second count is equal to a second critical value. If the judgment result of the first judgment unit 112 is that the increased second count is equal to the second critical value, the decision unit 113 decides to send the current channel quality indicator and negative acknowledgment (NACK) information to the base station.

The second possible situation is that if the current CQI is greater than the previous CQI, the transceiver 11 may include a second counter 115 and a decision unit 113 . The second counter 115 can decrease the second count, and the decision unit 113 decides not to send the channel quality indicator to the base station.

The third possibility is that if the current CQI is equal to the previous CQI, it means that the channel quality remains unchanged, so the transceiver 11 keeps the previous CQI unchanged.

Compared with the prior art, the method for adaptively transmitting CQI according to the present invention and the mobile unit applying the method do not periodically or fixedly report CQI when transmitting certain communication information, but consider packet The correctness of the CQI and the variation of the CQI are used to determine whether to transmit the CQI to the base station. In this way, excessive power consumption and unnecessary interference caused by too many CQI reports can be avoided. In addition, because the method and the mobile unit according to the present invention also consider the correctness of the packet, it can also avoid the problem of not correcting the CQI in real time in some prior art.

Through the detailed description of the above preferred specific embodiments, it is hoped that the characteristics and spirit of the present invention can be described more clearly, rather than the scope of the present invention is limited by the preferred specific embodiments disclosed above. On the contrary, the intention is to cover various changes and equivalents within the scope of the appended claims of the present invention. Therefore, the scope of the claims applied for in the present invention should be interpreted in the broadest way based on the above description, so as to cover all possible changes and equivalent replacements.

Symbol Description

S11～S151: process steps

10: Mobile unit 11: Transceiver

12: Evaluation module 13: Judgment module

14: Comparison module 111: The first counter

112: The first judgment unit 113: The decision unit

114: The second judging unit 115: The second counter.

Claims (10)

1. indicate adaptability to be sent to the method for base station channel quality from mobile unit for one kind, it is characterized in that, comprise the following step:

(a) the current channel quality indication of decision;

(b) from described base station package is sent to described mobile unit, and detects described package and whether correctly be received;

(c) more described current channel quality indication and previous channel quality indication; And

(d) according to the comparative result of the testing result and the step (c) of step (b), whether decision will described current channel quality be indicated and is sent to described base station.

2. method according to claim 1, wherein step (d) comprises:

If described package that described mobile unit received be correct and described current channel quality indication greater than described previous channel quality indication, increase by first counting and replace described previous channel quality indication with described current channel quality indication; And

If first counting after the described increase equals first critical value, transmit described current channel quality indication to described base station.

3. method according to claim 1, wherein step (d) comprises:

If described package that described mobile unit received be correct and described current channel quality indication less than described previous channel quality indication, reduce by first counting.

4. method according to claim 1, wherein step (d) comprises:

If described package that described mobile unit received is correct and described current channel quality indication equals described previous channel quality indication, judge that described current channel quality indicates whether to equal maximum; And

If described current channel quality indication is kept first counting less than described maximum.

5. method according to claim 4, wherein step (d) further comprises:

If described current channel quality indication equals described maximum, increase described first counting;

Judge whether first counting after the described increase equals first critical value; And

If first counting after the described increase equals described first critical value, transmit described current channel quality indication to described base station.

6. method according to claim 1, wherein step (d) comprises:

Indicate less than described previous channel quality if the described package that described mobile unit received is incorrect and described current channel quality indication, increase by second counting and replace described previous channel quality and indicate with described current channel quality indication;

Judge whether second counting after the described increase equals second critical value; And

If second counting after the described increase equals described second critical value, transmit described current channel quality indication and negative affirmation (NACK) information to this base station.

7. method according to claim 1, wherein step (d) comprises:

Indicate greater than described previous channel quality if the described package that described mobile unit received is incorrect and described current channel quality indication, reduce second counting and decision and do not transmit extremely described base station of described current channel quality indication.

8. method according to claim 1, wherein step (d) comprises:

Equal described previous channel quality indication if the described package that described mobile unit received is incorrect and described current channel quality indication, keep described previous channel quality indication.

9. method according to claim 1, wherein said package is transferred into described mobile unit by at least one passage, and in step (a), described current channel quality indication is periodically produced by assessing described at least one channel.

10. a mobile unit is characterized in that, comprises:

Transceiver is in order to receive package by at least one channel from the base station;

Evaluation module is in order to assess described at least one passage, to produce current channel quality indication;

Judge module, whether correct in order to judge the described package that described transceiver receives; And

Comparison module is in order to more described current channel quality indication and previous channel quality indication;

Whether wherein said transceiver is sent to described base station with described current channel quality indication according to the judged result of described judge module and the comparative result decision of described comparison module.

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