HK1146427A - Reverse link traffic power control - Google Patents

Description

Reverse link traffic power control

Technical Field

The following description relates generally to wireless communications and, more particularly, to delta-based reverse link traffic power control.

Background

Wireless network systems have become a popular tool for most people in the world to communicate. Wireless communication devices have become smaller and more powerful in order to meet consumer needs and to improve portability and convenience. Consumers have come to rely on wireless communication devices, such as cellular telephones, Personal Digital Assistants (PDAs), etc., which require reliable service, expanded coverage areas, and increased functionality.

Generally, a wireless multiple-access communication system can simultaneously support communication for multiple wireless terminals or user devices. Each terminal communicates with one or more access points via transmissions on the forward and reverse links. The forward link (or downlink) refers to the communication link from the access points to the terminals, and the reverse link (or uplink) refers to the communication link from the terminals to the access points.

A wireless system may be a multiple-access system capable of supporting communication with multiple users by sharing the available system resources (e.g., bandwidth and transmit power). Examples of such multiple-access systems include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems.

Typically, each access point supports terminals that are located within a particular coverage area, referred to as a sector. The sector supporting a particular terminal is referred to as the serving sector. Other sectors that do not support a particular terminal are referred to as non-serving sectors. Terminals within a sector can be assigned specific resources to allow simultaneous support for multiple terminals. However, transmissions by terminals in adjacent sectors are not coordinated. Thus, transmissions by terminals at the edge of a sector may cause interference and degradation in terminal performance.

Disclosure of Invention

The following presents a simplified summary of one or more embodiments in order to provide a basic understanding of such embodiments. This summary is not an extensive overview of all contemplated embodiments, and is intended to neither identify key or critical elements of all embodiments nor delineate the scope of any or all embodiments. Its sole purpose is to present some concepts of one or more embodiments in a simplified form as a prelude to the more detailed description that is presented later.

According to one aspect, a method that facilitates reverse link traffic channel power control is described herein. The method may include providing power control information in the allocation. In addition, the method may include broadcasting an interference offset value for each subband used to establish the adjustment range. The method can also include broadcasting an Other Sector Interference (OSI) indication for adjusting the power control value.

Another aspect relates to a wireless communications apparatus that can include a memory that retains instructions related to: broadcast an interference offset value for each subband, broadcast a regular Other Sector Interference (OSI) parameter, and broadcast a fast OSI parameter. The wireless communications apparatus can also include a processor, coupled to the memory, configured to execute the instructions retained in the memory.

Yet another aspect relates to a wireless communications apparatus that facilitates delta-based power control. The apparatus can include means for providing power control information in an allocation of a mobile device. Additionally, the apparatus can include means for broadcasting an interference offset value for each subband. The apparatus can also include means for broadcasting OSI indications that enable delta-based power control.

Yet another aspect relates to a machine-readable medium having stored thereon machine-executable instructions for providing power control information in an allocation. The machine-readable medium can also include instructions for broadcasting an interference offset value for each subband, the interference offset value used to establish an adjustment range. Additionally, the machine-readable medium can include instructions for broadcasting OSI indications for adjusting power control values.

According to another aspect, an apparatus may include an integrated circuit in a wireless communication system. The integrated circuit can be configured to assign a reverse link traffic channel to a mobile device. The integrated circuit can also be configured to provide information related to power control in the allocation and broadcast regular and fast OSI indications to at least one mobile device to facilitate delta-based power control.

According to yet another aspect, a method of implementing delta-based power control is described herein. The method may include establishing an allowed range of delta values based in part on power control related information included in the allocation. Additionally, the method can include estimating an adjustment to the delta value based in part on a broadcasted Other Sector Interference (OSI) indication. The method can also include setting a power spectral density corresponding to a reverse link traffic channel as a function of the delta value.

Another aspect described herein relates to a wireless communications apparatus that can include a memory that retains instructions related to: establishing an allowed range for a delta value based in part on power control related information included in the allocation, estimating an adjustment to the delta value based in part on the broadcasted OSI indication, and setting a power spectral density corresponding to a reverse link traffic channel according to the delta value. Additionally, the wireless communications apparatus can include an integrated circuit coupled to the memory that executes the instructions retained in the memory.

Yet another aspect relates to a wireless communications apparatus that enables delta-based power control. The apparatus can include means for establishing an allowed range of delta values based in part on information related to power control included in the allocation. Additionally, the apparatus can include means for estimating an adjustment to the delta value based in part on the broadcasted OSI indication. The apparatus can additionally include means for setting a power spectral density corresponding to a reverse link traffic channel based on the delta value.

Yet another aspect relates to a machine-readable medium having stored thereon machine-executable instructions for establishing an allowable range of delta values based in part on power control related information included in the allocation. The machine-readable medium can also include instructions for estimating an adjustment to the delta value based in part on the broadcasted Other Sector Interference (OSI) indication. Additionally, the machine-readable medium can comprise instructions for setting a power spectral density corresponding to a reverse link traffic channel as a function of the delta value.

Yet another aspect relates to an integrated circuit configured to establish an allowable range of delta values based in part on power control related information included in the allocation. Additionally, the integrated circuit can be configured to determine an adjustment to the delta value based in part on a broadcasted Other Sector Interference (OSI) indication. Further, the integrated circuit can be configured to set a power spectral density corresponding to a reverse link traffic channel based on the delta value.

To the accomplishment of the foregoing and related ends, the one or more embodiments comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects of the one or more embodiments. These aspects are indicative, however, of but a few of the various ways in which the principles of various embodiments may be employed and the described embodiments are intended to include all such aspects and their equivalents.

Drawings

Fig. 1 illustrates a wireless communication system in accordance with one or more aspects set forth herein.

Fig. 2 illustrates a wireless communication system in accordance with various aspects set forth herein.

Fig. 3 illustrates an exemplary wireless communication system that effectuates reverse link traffic power control in accordance with aspects of the disclosed subject matter.

Fig. 4 illustrates an example methodology that facilitates reverse link power control in accordance with an aspect of the disclosed subject matter.

Fig. 5 illustrates an exemplary method of estimating a slow delta value based on broadcasted interference information.

Fig. 6 illustrates an example methodology that facilitates adjusting transmit power based on broadcasted interference information.

Fig. 7 illustrates an example mobile device that facilitates reverse link transmit power control.

Fig. 8 illustrates an example system that facilitates reverse link power control by providing information related to power control.

Fig. 9 illustrates an exemplary wireless network environment that can be employed in conjunction with the various systems and methods described herein.

Fig. 10 illustrates an example system that facilitates power control via interference information broadcast.

Fig. 11 illustrates an example system that facilitates reverse link transmit power control.

Detailed Description

Various embodiments are now described with reference to the drawings, wherein like reference numerals are used to refer to like parts throughout. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

As used in this application, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, such as but not limited to hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to: a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component may be localized on one computer and/or distributed between two or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate by way of local and/or remote processes based on a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).

Moreover, various embodiments are described herein in connection with a mobile device. A mobile device can also be called a system, subscriber unit, subscriber station, mobile, remote station, remote terminal, access terminal, user terminal, wireless communication device, user agent, user device, or User Equipment (UE). The mobile device may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device having wireless connection capability, a computing device, or other processing device connected to a wireless modem. Moreover, various embodiments are described herein in connection with a base station. A base station can be utilized for communicating with mobile device(s) and can also be referred to as an access point, a node B, or some other terminology.

Furthermore, various aspects or features described herein may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used herein is intended to encompass a computer program accessible from any computer-readable device, carrier, or media. For example, computer-readable media may include, but are not limited to: magnetic storage devices (e.g., hard disk, floppy disk, magnetic strips, etc.), optical disks (e.g., Compact Disk (CD), Digital Versatile Disk (DVD), etc.), smart cards, and flash memory devices (e.g., EPROM, card, stick, key disk, etc.). In addition, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" can include, but is not limited to: wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.

Referring now to fig. 1, illustrated is a wireless communication system 100 in accordance with various aspects set forth herein. System 100 can comprise one or more access points 102 that receive, transmit, retransmit, etc., wireless communication signals to each other and/or to one or more terminals 104. Each base station 102 can comprise a plurality of transmitter chains and receiver chains (e.g., one for each transmit and receive antenna), each of which can in turn comprise a plurality of components associated with signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.). The terminal 104 may be, for example, a cellular phone, a smart phone, a laptop computer, a handheld communication device, a handheld computing device, a satellite radio, a global positioning system, a PDA, and/or any other suitable device for communicating over the wireless system 100. In addition, each terminal 104 can include one or more transmitter chains and receiver chains, e.g., for a multiple-input multiple-output (MIMO) system. As will be appreciated by one skilled in the art, each transmitter and receiver chain can include a number of components associated with signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.).

As shown in fig. 1, each access point provides communication coverage for a particular geographic area 106. The term "cell" can refer to an access point and/or its coverage area, depending on the context. To increase system capacity, the coverage area of an access point may be divided into multiple smaller areas (e.g., three smaller areas 108A, 108B, and 108C). Each smaller area is served by a respective Base Transceiver Subsystem (BTS). The term "sector" can refer to a BTS and/or its coverage area, depending on the context. For a sectorized cell, the base transceiver subsystems for all sectors of the cell are typically co-located within the access points of the cell.

Terminals 104 are typically dispersed throughout the system 100. Each terminal 104 may be fixed or mobile. Each terminal 104 may communicate with one or more access points 102 on the forward and reverse links at any given moment.

For a centralized architecture, a system controller 110 couples to access points 102 and provides coordination and control for access points 102. For a distributed architecture, access points 102 may communicate with each other as needed. Communication between access points through the system controller 110 or the like may be referred to as backhaul signaling.

The techniques described herein may be used for system 100 with sectorized cells as well as systems with unsectorized cells. For clarity, the following description is directed to a system having sectorized cells. The term "access point" is used generically for a fixed station that serves a sector, as well as a fixed station that serves a cell. The terms "terminal" and "user" are used interchangeably, and the terms "sector" and "access point" are also used interchangeably. A serving access point/sector is an access point/sector with which a terminal has reverse link traffic transmissions. A neighboring access point/sector is an access point/sector with which a terminal has no reverse link traffic transmission. For example, an access point that serves only the forward link to a terminal should be considered a neighboring sector for interference management purposes.

Referring now to fig. 2, a wireless communication system 200 is illustrated in accordance with various embodiments set forth herein. System 200 includes a base station 202 that can include multiple antenna groups. For example, one antenna group can include antennas 204 and 206, another can include antennas 208 and 210, and an additional can include antennas 212 and 214. Two antennas are shown for each antenna group; however, more or fewer antennas may be utilized for each antenna group. Those skilled in the art will appreciate that base station 202 can additionally include a transmitter chain and a receiver chain, each of which can in turn comprise a plurality of components associated with signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.).

Base station 202 can communicate with one or more mobile devices, such as mobile device 216 and mobile device 222; however, it is to be appreciated that base station 202 can communicate with substantially any number of mobile devices similar to mobile devices 216 and 222. Mobile devices 216 and 222 may be, for example, cellular phones, smart phones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other suitable device for communicating over wireless system 200. As depicted, mobile device 216 is in communication with antennas 212 and 214, where antennas 212 and 214 transmit information to mobile device 216 over a forward link 218 and receive information from mobile device 216 over a reverse link 220. In addition, mobile device 222 is in communication with antennas 204 and 206, where antennas 204 and 206 transmit information to mobile device 222 over a forward link 224 and receive information from mobile device 222 over a reverse link 226. In a Frequency Division Duplex (FDD) system, forward link 218 can utilize a different frequency band than that used by reverse link 220, and forward link 224 can employ a different frequency band than that employed by reverse link 226, for example. Further, in a Time Division Duplex (TDD) system, forward link 218 and reverse link 220 can utilize a common frequency band and forward link 224 and reverse link 226 can utilize a common frequency band.

The area in which groups of antennas and/or antennas are assigned to communicate can be referred to as a sector of base station 202. For example, multiple antennas can be designed to communicate to mobile devices in a sector of the areas covered by base station 202. In communication over forward links 218 and 224, the transmitting antennas of base station 202 can utilize beamforming to improve signal-to-noise ratio of forward links 218 and 224 for mobile devices 216 and 222. Moreover, base station 202 can cause less interference to mobile devices in neighboring cells when it utilizes beamforming to transmit to mobile devices 216 and 222 that are scattered randomly through an associated coverage as compared to a base station transmitting through a single antenna to all its mobile devices.

According to an example, system 200 can be a multiple-input multiple-output (MIMO) communication system. Moreover, system 200 can utilize any type of duplexing technique to divide communication channels (e.g., forward link, reverse link … …), such as FDD, TDD, etc. Further, system 200 can employ information broadcasting to implement dynamic power control of the reverse link. As illustrated, base station 202 can transmit power control related information to mobile devices 216 and 222 via forward links 218 and 224. Information related to power control can be included in the reverse link data channel assignments provided to the mobile devices 216 and 222. Base station 202 can broadcast an indication of Other Sector Interference (OSI). For example, base station 202 can broadcast regular other sector interference (regular OSI) values per superframe and fast other sector interference (fast OSI) values per subband on each reverse link frame. Other sector interference is broadcast to mobile devices (not shown) in other sectors not served by base station 202. In addition, mobile devices 216 and 222 receive other sector interference values that are broadcast from base stations other than base station 202. The mobile devices 216 and 222 can also receive power control related information included in the assignment from the base station 202. Thus, the mobile devices 216 and 222 can employ the received other sector interference value and power control information to adjust power on the reverse link data channel. For example, the mobile devices 216 and 222 can utilize the fast other sector interference value to maintain and adjust a transmit delta value that is used to adjust the power spectral density of the reverse link data channel. In addition, mobile devices 216 and 222 can employ conventional other sector interference values to maintain and adjust slow delta values (slow delta values) that can be transmitted to base station 202 over reverse links 220 and 226, respectively. The slow delta value may be used by base station 202 as a suggested value for future allocations.

Turning now to fig. 3, illustrated is a wireless communication system 300 that effectuates reverse link transmit power control based upon consideration of a broadcasted interference value. System 300 includes a base station 302 that communicates with one mobile device 304 (and/or with any number of dispersed mobile devices (not shown)). Base station 302 can transmit information related to power control to mobile device 304 over a forward link and broadcast other sector interference values to mobile devices in other sectors not served by base station 302. In addition, base station 302 can receive information from mobile device 304 over a reverse link channel. Further, system 300 can be a MIMO system.

Base station 302 can comprise a scheduler 306, an other-sector interference (OSI) broadcaster 308, and an interference offset broadcaster 310. Wherein the scheduler 306 provides channel assignments to the mobile devices 304. The assignment may include a channel ID that specifies a set of hop ports through a channel tree. The assignment may also specify a packet format. The packet format may be the coding and/or modulation to be employed for transmission on the allocated resources. Further, the allocation may include parameters indicating that the allocation is an extended transmission duration allocation and/or indicating whether the allocation should replace or supplement an existing allocation. In accordance with aspects of the subject disclosure, each packet format has an associated minimum carrier-to-interference ratio (C/I) value for the data channel (hereinafter referred to as DataCtoI)_min)。DataCtoI_minThe value corresponds to the minimum C/I required to achieve a particular error rate at a particular hybrid automatic repeat request (HARQ) attempt. In addition, scheduler 306 communicates minimum and maximum carrier over thermal (carrier over thermal) values for the data channels (hereinafter referred to as DataCoT)_minAnd DataCoT_max). These values can be included in the assignment issued by the scheduler 306 of the base station 302 to the mobile device 304. Further, the assignment from the scheduler 306 can include the C/I value, DataCtoI, of the data channel assigned to the mobile device 304_assigned. The value is selected based on the end point of the target HARQ. According to one aspect of the subject disclosure, a DataCtoI_assignedCan be used to indicate to the mobile device its current delta value on the assignment interlace. In addition, scheduler 306 determines a maximum increment increase value (maxdeltainrelease) and a maximum increment decrease value (maxdeltarereduction) for each quality of service (QoS) level. Notwithstanding the above parameters (e.g., DataCtoI)_min、DataCoT_min、DataCoT_max、DataCtoI_assignedStep size, etc.) are assigned by base station 304, it should be appreciated that these parameters are not necessarily assigned by the same mechanism or at the same time. For example, DataCtoI_min、DataCoT_minAnd the step size may be a semi-static parameter, without assigning them for each packet or assignment. Whenever updating is required, the updating can be performed through messages of upper layersThese parameters are updated.

These values can be used by the mobile device 304 to make power control decisions. For example, these parameters may be used to establish a range of transmit delta adjustments. The range may be specified in a number of ways. According to one aspect, an unambiguous DataCtoI_minAnd DataCoT_minValues may be assigned and used to establish the range. In addition, relative constraints may be employed, for example, by parameters specifying a maximum decrease or increase in the increment or C/I value. By way of illustration, the parameters maxdeltainrelease and MaxDeltaReduction may be utilized. According to another illustration, a maxctoincreate value and a maxctoirrection value may be employed. It should be appreciated that combinations are also possible (e.g., maxdelta increase and maxctoirrection).

The scheduler 306 allocates resources (channels, frequencies, bandwidths, etc.) to the mobile devices 304. The base station 302 employing the scheduler 306 makes allocation decisions based on various considerations. For example, the allocation decision may take into account information received over a reverse request channel (R-REQCH). The request may include a buffer size or a quality of service (QoS) level. Additionally, the scheduler 306 can base allocation decisions on other feedback information received from the mobile device 304. The scheduler 306 may take into account the received feedback information, e.g. a slow delta value used as a suggested value for future allocations. The feedback information may also include power amplifier headroom (headroom), an indication of fast OSI action, and the like.

Base station 302 can also include OSI broadcaster 308 to broadcast other sector interference information to mobile devices in other sectors not served by base station 302. At each superframe, base station 302 employs OSI broadcaster 308 to broadcast regular OSI values to mobile devices. The regular OSI value represents the average interference observed during the previous superframe. It should be appreciated that more than one previous superframe may be averaged. By way of example and not limitation, the regular OSI value may include an average interference observed during the previous three superframes. According to one aspect, the regular OSI values can be broadcast on a broadcast channel, such as the forward link OSI pilot channel (F-OSICH). In addition, a regular OSI indication may be transmitted on the superframe preamble of each superframe. Delta-based power control by mobile device 304 based on regular OSI indications from base stations in other sectors can result in tight interference distribution in a full buffer scenario.

In a bursty transaction scenario, more dynamic power level control may be required. Accordingly, OSI broadcaster 308 also broadcasts fast OSI values received by mobile device 304 and other mobile devices served by base station 302. The fast OSI indication can be broadcast over a fast OSI channel (F-FOSICH) on the forward link control segment. By way of example and not limitation, each of the fast OSI reports may be grouped into four-bit sets, and each set may be transmitted over a forward pilot quality indication channel (F-PQICH) using six modulation symbols in a manner similar to data transmission. In this example, the erasures may be mapped to an all-zeros sequence such that there is no fast OSI indication on any of the involved subbands. The fast OSI values may be broadcast for each subband on each interlace of each reverse link frame. The fast OSI value can be based on interference observed on a particular subband on a particular reverse link frame.

Base station 302 also includes an interference offset broadcaster 310. To reduce packet errors in the event of a large interference-over-thermal (IoT) rise due to bursty traffic in neighboring sectors, base station 302 may employ fast IoT reporting by interference offset broadcaster 310. Base station 302 can further employ scheduler 306 to facilitate dynamic adjustment of a minimum allowed delta value for each allocation, as described below. An interference offset broadcaster transmits an interference offset value InterferceOffset for each sub-band s_s. This value is based at least in part on the amount of interference observed by base station 302 on subband s filtered across the plurality of interlaces. This value may be transmitted over a forward interference over thermal noise ratio channel (F-iocch).

In addition to the above reports, base station 302 can transmit quantized information regarding received control pilot carrier-to-thermal noise ratio (CoT) Power Spectral Density (PSD) for mobile device 304 (if active) and for all active mobile devices in the sector served by base station 302. This information may be transmitted through the F-PQICH. This information and the values described above can be used by the mobile device 304 to perform delta-based power control. In accordance with aspects of the subject disclosure, the mobile device 304 maintains and adjusts the slow delta value and the transmit delta value.

The delta value is the offset between the PSD of the control pilot and the traffic PSD. The delta value is related to the received C/I value (e.g., DataCtoI) by controlling pilot carrier to thermal noise ratio psd (pcot) and traffic to interference to thermal noise ratio psd (iot). For example, the delta value may be mapped to a data C/I value according to the following equation:

Δ＝CoT_data-CoT_control

Δ＝CoI_data+IoT_data-CoT_control

according to this specification, CoT_dataIs the carrier to thermal noise ratio of the data or traffic channel. Value CoT_controlIs the carrier to thermal noise ratio of the control channel, e.g., the pilot channel PSD value (pCoT) received from the base station. Accordingly, delta value Δ is the difference or offset between the control and traffic PSD values. CoT_dataEqual to the C/I value CoI of the data channel_dataInterference over thermal noise ratio (IoT) with data channel_dataThe sum of (1). As described earlier, CoI_dataCan be a DataCtoI value assigned by the base station to the mobile device. In addition, IoT_dataMay be an interference offset value transmitted by the base station.

The mobile device 304 maintains and adjusts the delta value according to the delta value range. The delta value range is established by the mobile device 304 based on received broadcast information or information included in the allocation from the base station 302. For example, the mobile device 304 sets the minimum slow delta value Δ based on the following equation_slow，minAnd a maximum slow delta value Δ_slow，max：

Δ_slow，min＝DataCoT_min-pCoT_RLSS

Δ_slow，max＝DataCoT_max-pCoT_RLSS

Value DataCoT_minAnd DataCoT_maxRespectively, minimum and maximum carrier-to-thermal noise ratio PSD values for traffic channels, which are provided by base station 302 as part of the assignment. Value pCoT_RLSSIs the carrier to thermal noise ratio PSD value of the pilot channel of the reverse link serving sector. Thus, the mobile device 304 sets the slow delta value range based on the indication broadcast or assigned by the base station 302.

The mobile device 304 includes a slow delta estimator 312 for maintaining and adjusting the slow delta value Δ_slow. Slow delta estimator 312 determines and adjusts the slow delta value based on regular OSI indications broadcast by other sector base stations similar to base station 302. At each superframe, the slow delta estimator 312 generates an OSI monitor set. The OSI monitoring set is formed by applying a threshold to the forward link geometry of sectors available to the mobile device 304. In addition, the OSI monitor set can be formed by applying a threshold to channel difference (chandiff) values of other sectors. It should be appreciated that separate monitoring sets can be generated for other sector base stations broadcasting fast OSI indications. The fast OSI monitoring set can be limited to members of the active set of the mobile device 304. Sectors that include the reverse link serving sector for mobile device 304 are not included in the OSI monitoring set. The OSI monitoring set includes sectors that may be affected by interference caused by the mobile device 304. Slow delta estimator 312 calculates a channel difference value for each member of the OSI monitor set. The channel difference is based on the received power on the acquisition pilot, while taking into account the transmit power of each sector in the monitored set. Slow delta estimator 312 adjusts the slow delta value based in part on regular OSI values broadcast from multiple members of the OSI monitor set. The slow delta estimator 312 also considers the calculated corresponding channel difference value, as well as the current slow delta value for the mobile device 304. Adjusting the slow delta value has the following limitations: the value cannot be below the minimum value nor above the maximum value. The mobile device 304 can communicate the adjusted slow delta value to the base station 302, which can be served by the reverse link. The transmitted value is used by the base station 302 for future allocationA suggested value.

The mobile device 304 also includes a transmission delta estimator 314 for maintaining and adjusting the transmission delta value Δ_tx. Transmit delta estimator 314 determines and varies transmit delta values based on fast OSI indications broadcast by other sector base stations similar to base station 302. Adjustments may also be made for each sub-band when each sub-band has a fast OSI indication. After allocation on sub-band s, the explicit DataCtoI provided by the scheduler 306 of the base station 302 is used_assignedThe transmit delta estimator 314 establishes a range of transmit delta values. For each packet (or sub-packet) p to be transmitted on a sub-band s, the transmit delta estimator 314 establishes a minimum delta value Δ according to the following equation_min，pAnd an assigned or maximum delta value Δ_max，p：

Δ_min，p＝InterferenceOffset_RLSS，s-pCoT_RLSS+DataCtoI_min，p

Δ_max，p＝InterferenceOffset_RLSS，s-pCoT_RLSS+DataCtoI_assigned，p

According to the equation specification, the value InterferenceOffset_RLSS，sIs an indication of the interference over thermal noise level for subband s in the reverse link serving sector. This value is broadcast by the base station 302 and received by the mobile device 304. Value pCoT_RLSSIs the pilot CoT PSD used in the reverse link serving sector for mobile device 304. Value DataCtoI_min，pIs the minimum C/I value corresponding to packet p. The mobile device 304 receives the value DataCtoI within the allocation from the scheduler 306 in the base station 302_assigned，p. Transmit delta estimator 314 utilizes the most recent (i.e., not cleared) values of InterferenceOffset and pCoT. Additionally, transmit delta estimator 314 can utilize a default sector specific interference over thermal noise ratio value if the channel transmitted interference offset is cleared for multiple reporting intervals.

At the establishment of the transmission increment value delta_txAfter range, transmit delta estimator 314 is based on neighboring sector broadcasts and is broadcast by mobile device 304 received fast OSI indications to adjust the value. Initially, the transmit delta value is initialized to Δ as previously estimated_max. After initialization, the transmission delta value is adjusted by incrementally increasing or decreasing the transmission delta value based on consideration of the fast OSI indication being broadcast. For retransmission on interlace i, transmit delta estimator 314 adjusts the transmit delta value in response to a fast OSI indication corresponding to a previous transmission on the interlace. The adjustment may be achieved according to the following equation:

according to this example, the value fastOSI_iIs the fast OSI indication received corresponding to interlace i. The values fastosistepupp and fastOSIStepDown are the step sizes for transmitting the increment value up and down, respectively. The limitation of the adjustment made by the transmit delta estimator 314 is that the transmit delta value can neither exceed delta_maxNor must it be below Δ_min. For cells that do not include any explicit DataCtoI_assignedNew grouping or allocation of values without initializing the transmit delta value to delta_max. Instead, the transmit delta estimator 314 utilizes the most recent transmit delta value and performs the same adjustments as described above.

In accordance with another aspect of the subject disclosure, mobile device 304 can include a PSD adjuster 316 that can set a transmit PSD for an assigned reverse link data channel (e.g., R-DCH) for each assignment. It should be appreciated that the transmit PSD can be set for each sub-band when each sub-band has a transmit delta value and a fast OSI indication. The transmit PSD for the data channel is established according to the following equation: PSD_R-DCH＝PSD_R-PICH+Δ_tx+AttemptBoost_j

According to the equation, j is the sub-packet index, the promotion value AttemptBoost_jAssigned by base station 302. Value PSD_R-PICHIs the PSD of the reverse link pilot channel. If the generated transmission power is greater than the maximum available for the serviceWith large transmit powers, PSD adjuster 316 scales the data PSD so that the total transmit power is the maximum transmit power.

Further, in accordance with another aspect of the subject disclosure, the mobile device 304 provides feedback to the base station 302. The mobile device 304 can transmit out-of-band reports and in-band reports. The out-of-band report may include information related to carrier over thermal noise ratio or channel difference. For example, the mobile device 304 can transmit the maximum available received CoT value across the band. The CoT value may be an indication of PA headroom. This value may be calculated using pilot CoT feedback received on the pilot quality indication channel of the forward link. According to an example, the value is transmitted only if a substantial change has previously been reported. In addition, the mobile device 304 can report the channel difference to the base station 302. Similar to the reported CoT value, the value may be reported only after a substantial change has occurred.

In addition to in-band requests, the mobile device 304 can report information related to power control. For example, the mobile device 304 can report a power amplifier headroom value, a slow delta value, or transmit a transmit delta value corresponding to a most recently adjusted value. Similar to the out-of-band reports, these reports may be transmitted only after significant changes to the previous reports occur.

Referring to fig. 4-6, related methodologies for reverse link power adjustment based on broadcast interference information are illustrated. While, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more embodiments, occur in different orders and/or concurrently with other acts from that shown and described herein. For example, those skilled in the art will understand and appreciate that a methodology could alternatively be represented as a series of interrelated states or events, such as in a state diagram. Moreover, not all illustrated acts may be required to implement a methodology in accordance with one or more embodiments.

Turning now to fig. 4, a methodology 400 that facilitates reverse link transmit power control is illustrated. The method 400 may be performed by a base station in accordance with aspects of the subject disclosure. The method 400 can be utilized, among other things, to provide parameters for a mobile device that are relevant to power control decisions. At reference numeral 402, a power control parameter is included in an allocation. For example, the allocation can be an assignment of frequency resources to a particular mobile device or a designation of a reverse link data channel. The power control parameters may include minimum and maximum carrier-to-thermal noise ratios for the reverse link data channel. In addition, the power control parameters can include an assigned or target C/I value associated with a particular sub-band to which the mobile device is to be assigned. The power control parameters may not be included in every allocation because the semi-static parameters may only be allocated when the parameters require updating. At reference numeral 404, a mobile device is assigned. The allocation decision may be based in part on feedback information received from the mobile device. Based on the projected interference and/or the reporting of excessive fast OSI actions, the feedback information can include delta values (e.g., slow delta value and transmit delta value), power amplifier headroom, buffer size, QoS level, maximum allowed power.

At reference numeral 406, a regular OSI indication is broadcast. The broadcast may be done once per superframe and the indication may be included in a superframe preamble. The regular OSI indication is the average interference observed during the previous superframe. This value helps determine the slow delta value. At reference numeral 408, a fast OSI indication is broadcast. The broadcast may be for each subband on each reverse link frame. The fast OSI indications indicate interference observed on a particular subband on a particular reverse link frame. Fast OSI indications help determine transmit delta values. At reference numeral 410, an interference offset value is broadcast. An interference offset value is broadcast for each subband. This value represents the amount of interference observed on a particular subband filtered across multiple interlaces. For example, the interference offset value may represent an IoT level for the subband.

Turning to fig. 5, illustrated is a methodology 500 for implementing reverse link power control in wireless communications. Therein, the method 500 can be utilized by a mobile device to generate a slow delta value that is utilized by a base station for future allocation decisions. At reference numeral 502, a range of slow delta values is determined. The range may be based on a parameter included in the allocation. For example, the range may be calculated based on consideration of the minimum and maximum CoT values included in the allocation and the PSD of the pilot channel. The range defines minimum and maximum values for the slow delta value such that adjustments to the slow delta value are limited to within the range. These values may also be included in previous allocations rather than the most current allocation. For example, certain parameters may be semi-static and only need to be updated periodically. At reference numeral 504, a slow delta value is estimated or adjusted. This value is estimated based on regular OSI broadcasts from members of the monitored set. In addition, channel differences corresponding to members of the monitored set may be considered as well as the current slow delta value. At reference numeral 506, the adjusted slow delta value is transmitted. This value may be communicated to a base station serving the reverse link of the mobile device for future allocation decisions.

Referring to fig. 6, a method 600 of implementing reverse link power adjustment is illustrated. Method 600 can be employed by a mobile device in a wireless communication system to set a PSD for a reverse link traffic channel. At reference numeral 602, a range of transmit delta values is established. The range may be based on a value included in the assignment. In addition, the range may be determined based on consideration of the interference offset value and the CoT value of the pilot channel. At reference numeral 604, a transmit delta value is estimated or adjusted. The adjustment may be based on a fast OSI indication of the broadcast. For example, the transmit delta value can be initialized to a maximum value and then adjusted up or down the assigned step size according to the fast OSI indication. Indications of increased interference in other sectors typically result in a step-down in the transmit delta value, while no indication may result in a step-up in the transmit delta value. At numeral 606, the power spectral density of the reverse link traffic channel is set. The PSD is established based on the transmit delta value. For example, in accordance with aspects of the subject disclosure, the traffic channel PSD is set to the sum of the pilot channel PSD and the transmit delta value. Additionally, the assigned boost value may be included in the sum.

It will be appreciated that inferences can be made regarding assigning mobile devices, generating OSI monitoring sets, determining channel differences, estimating slow delta values, etc., in accordance with one or more aspects described herein. As used herein, the term to "infer" or "inference" refers generally to the process of reasoning about or inferring states of the system, environment, and/or user from a set of observations as captured via events and/or data. Inference can be employed to identify a specific context or action, or can generate a probability distribution over states, for example. The inference can be probabilistic-that is, the computation of a probability distribution over states of interest based on a consideration of data and events. Inference can also refer to techniques employed for composing higher-level events from a set of events and/or data. Such inference results in the construction of new events or actions from a set of observed events and/or stored event data, whether or not the events are correlated in close temporal proximity, and whether the events and data come from one or several event and data sources.

According to an example, one or more of the methods set forth above may include: inferences can be made regarding assigning mobile devices based upon consideration of slow delta values transmitted by the mobile devices to the base stations. By way of further illustration, inferences can be made regarding determining adjustments to slow delta values based on regular OSI indications, channel differences, and current delta values. It will be appreciated that the foregoing examples are illustrative in nature and are not intended to limit the number of inferences that can be made or the manner in which such inferences are made in conjunction with the various embodiments and/or methods described herein.

Fig. 7 illustrates a mobile device 700 that facilitates adjusting reverse link power based upon consideration of broadcasted interference information. Mobile device 700 comprises a receiver 702 that receives a signal from, for instance, a receive antenna (not shown), performs typical operations on (e.g., filters, amplifies, downconverts, etc.) the received signal, and digitizes the conditioned signal to obtain samples. Receiver 702 can be, for example, an MMSE receiver, and can comprise a demodulator 704 that can demodulate received symbols and provide them to a processor 706 for channel estimation. Processor 706 can be a processor dedicated to analyzing information received by receiver 702 and/or generating information for transmission by a transmitter 716; may be a processor that controls one or more components of mobile device 700; and/or a processor that both analyzes information received by receiver 702, generates information for transmission by a transmitter 716, and controls one or more components of mobile device 700.

Mobile device 700 can additionally comprise memory 708 that is operatively coupled to processor 706 and that can store data to be transmitted, received data, information related to available channels, data associated with analyzed signals, and/or interference strength, information related to an assigned channel, power, rate, or the like, and any other suitable information for estimating a channel and transmitting over the channel. Memory 708 can additionally store protocols and/or algorithms associated with estimating and/or utilizing a channel (e.g., performance based, capacity based, etc.).

It will be appreciated that the data store (e.g., memory 708) described herein can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. By way of illustration, and not limitation, nonvolatile memory can include Read Only Memory (ROM), programmable ROM (prom), electrically programmable ROM (eprom), electrically erasable prom (eeprom), or flash memory. Volatile memory can include Random Access Memory (RAM), which acts as external cache memory. By way of illustration and not limitation, RAM may take many available forms such as Synchronous RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 708 of the subject systems and methods is intended to comprise, without being limited to, these and any other suitable types of memory.

The receiver 702 is also operatively coupled to a slow delta estimator 710 that determines a slow delta value for the mobile device 700. Slow delta estimator 710 maintains and adjusts a slow delta value based on consideration of regular OSI indications broadcast by a base station and received by receiver 702 at mobile device 700. Slow delta estimator 710 establishes the OSI monitor set by applying a threshold to a forward link geometry of a sector other than the reverse link serving sector that mobile device 700 can acquire. A channel difference is calculated for each member of the monitored set. The slow delta value is adjusted based on an OSI supervisory set, a channel difference value, and/or a regular OSI indication. In addition, a slow delta value can be transmitted by the mobile device 700 to provide a suggested value for future assignment by the reverse link serving base station. Additionally, receiver 702 is coupled to a transmit delta estimator 712 that determines a transmit delta value for mobile device 700. A transmit delta estimator 712 maintains and adjusts transmit delta values based on consideration of fast OSI indications broadcast by base stations and received by receiver 702 at mobile device 700. After initializing the transmit delta value to a maximum value, transmit delta estimator 712 steps up or steps down the transmit delta value based on the fast OSI indications. The mobile device 700 can transmit the adjusted value as feedback to the serving base station.

Mobile device 700 still further comprises a modulator 714 and a transmitter 716, where transmitter 716 transmits a signal (e.g., a power limitation indication) to, for instance, a base station, another mobile device, etc. PSD adjuster 718 is coupled to processor 706 and transmitter 716. The PSD adjuster establishes a power spectral density of a reverse link traffic channel assigned to mobile device 700 based in part on the transmit delta value maintained and adjusted by transmit delta estimator 712 and the PSD of the pilot channel. Although depicted as being separate from the processor 706, it is to be appreciated that the slow delta estimator 710, the transmit delta estimator 712, the PSD adjuster 718, and/or the modulator 714 can be part of the processor 706 or multiple processors (not shown).

Fig. 8 illustrates a system 800 that facilitates reverse link power control by providing power control related information to a mobile device in a wireless communication system. System 800 includes a base station 802 (e.g., access point, … …), the base station 802 having a receiver 810 that receives signals from one or more mobile devices 904 via a plurality of receive antennas 806 and a transmitter 820 that transmits to the one or more mobile devices 804 via a transmit antenna 808. Receiver 810 can receive information from receive antennas 806 and is operatively associated with a demodulator 812 that demodulates received information. Demodulated symbols are analyzed by a processor 814, which processor 814 can be similar to that described above with reference to fig. 7, and coupled to a memory 816, which memory 816 stores information related to estimating signal (e.g., pilot) strength and/or interference strength, data to be transmitted or received from mobile device 804 (or a disparate base station (not shown)), and/or any other suitable information related to performing the various operations and functions set forth herein.

Processor 814 is further coupled to a scheduler 818 that assigns mobile devices 804 to reverse link traffic channels. Scheduler 818 makes allocation decisions based on considerations of buffer size, QoS level, and feedback information. The feedback information can include a delta value (e.g., a transmit delta value and a slow delta value) received from the mobile device 804. Additionally, the feedback information may include power amplifier headroom and an indication of excessive fast OSI action. Scheduler 818 includes information related to power control in the allocations. For example, scheduler 818 may include target C/I values, minimum and maximum CoT values, step sizes, and the like. Although these parameters are assigned by base station 802, it should be appreciated that these parameters are not necessarily assigned by the same mechanism or at the same time. For example, the step size and the minimum/maximum CoT value may be semi-static parameters that need not be assigned for each packet or assignment. These parameters may be updated by higher layer messages or the like whenever an update is required. These values can be used by the mobile device 804 for power control decisions.

Processor 814 is also coupled to a broadcaster 820. The broadcaster 820 broadcasts information to the mobile devices 804. This information is relevant to the power control decisions that the mobile device 804 is to make. For example, the broadcasted information may include a regular OSI indication broadcasted at each superframe, where the regular OSI indication represents an average interference observed during one or more previous superframes. Broadcaster 820 can also broadcast fast OSI indications corresponding to each sub-band. These indications represent the interference observed on these subbands. In addition, broadcaster 820 can broadcast an interference offset value based on an amount of interference observed on each subband filtered across multiple interlaces. A modulator 822 can multiplex the control information for transmission by a transmitter 824 through antenna 808 to mobile device 804. The mobile device 804 can be similar to the mobile device 700 described with reference to fig. 7 and employ the broadcasted information to adjust the transmit power. It should be appreciated that other functionality may be used in accordance with the subject disclosure. Although depicted as being separate from the processor 814, it is to be appreciated that the scheduler 818, broadcaster 820, and/or modulator 822 can be part of the processor 814 or multiple processors (not shown).

Fig. 9 illustrates an exemplary wireless communication system 900. The wireless communication system 900 depicts one base station 910 and one mobile device 950 for sake of brevity. However, it is to be appreciated that system 900 can include more than one base station and/or more than one mobile device, wherein additional base stations and/or mobile devices can be substantially similar or different from example base station 910 and mobile device 950 described below. Moreover, it is to be appreciated that base station 910 and/or mobile device 950 can employ the systems (fig. 1-3 and 7-8) and/or methods (fig. 4-6) described herein to facilitate wireless communication there between.

At base station 910, traffic data for a number of data streams is provided from a data source 912 to a Transmit (TX) data processor 914. According to an example, each data stream can be transmitted on a respective antenna. TX data processor 914 formats, codes, and interleaves the traffic data stream based on a particular coding scheme selected for that data stream to provide coded data.

The coded data for each data stream can be multiplexed with pilot data using Orthogonal Frequency Division Multiplexing (OFDM) techniques. Additionally or alternatively, the pilot symbols may be Frequency Division Multiplexed (FDM), Time Division Multiplexed (TDM), or Code Division Multiplexed (CDM). The pilot data is typically a known data pattern that is processed in a known manner and can be used at mobile device 950 to estimate channel response. The multiplexed pilot and coded data for each data stream can be modulated (e.g., symbol mapped) based on a particular modulation scheme (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QSPK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM), etc.) selected for that data stream to provide modulation symbols. The data rate, coding, and modulation for each data stream can be determined by instructions performed or provided by processor 930.

The modulation symbols for the data streams can be provided to a TX MIMO processor 920, which can further process the modulation symbols (e.g., for OFDM). TX MIMO processor 920 then passes N_TOne modulation symbol stream is provided to N_TAnd transceivers (TMTR/RCVR)922a through 922 t. In various embodiments, TX MIMO processor 920 applies beamforming weights to the symbols of the data streams and to the antenna from which the symbol is being transmitted.

Each transceiver 922 receives and processes a respective symbol stream to provide one or more analog signals, and further conditions (e.g., amplifies, filters, and upconverts) the analog signals to provide a modulated signal suitable for transmission over the MIMO channel. In addition, from N_TN from transceivers 922a through 922t are transmitted by antennas 924a through 924t, respectively_TA modulated signal.

At mobile device 950, by N_RThe transmitted modulated signals are received by antennas 952a through 952r and the received signal from each antenna 952 is provided to a respective transceiver (TMTR/RCVR)954a through 954 r. Each transceiver 954 conditions (e.g., filters, amplifies, and downconverts) a respective signal, digitizes the conditioned signal to provide samples, and further processes the samples to provide a corresponding "received" symbol stream.

RX data processor 960 may receive and process signals from N based on a particular receiver processing technique_RN received by a transceiver 954_RA stream of symbols to provide N_TA stream of "detected" symbols. RX data processor 960 can demodulate, deinterleave, and decode each detected symbol stream to recover the traffic data for the data stream. Processing by RX data processor 960Is the inverse of the processing performed by TX MIMO processor 920 and TX data processor 914 at base station 910.

A processor 970 can periodically determine which precoding matrix to use as discussed above. Further, processor 970 can formulate a reverse link message comprising a matrix index portion and a rank value portion.

The reverse link message may comprise various types of information regarding the communication link and/or the received data stream. The reverse link message may be processed by a TX data processor 938, which also receives traffic data for a number of data streams from a data source 936, modulated by a modulator 980, conditioned by transceivers 954a through 954r, and transmitted back to base station 910.

At base station 910, the modulated signals from mobile device 950 are received by antennas 924, conditioned by transceivers 922, demodulated by a demodulator 940, and processed by a RX data processor 942 to extract the reverse link message transmitted by mobile device 950. Further, processor 930 can process the extracted message to determine which precoding matrix to use for determining the beamforming weights.

Processors 930 and 970 can direct (e.g., control, coordinate, manage, etc.) operation at base station 910 and mobile device 950, respectively. Processors 930 and 970 can be associated with memory 932 and 972, respectively, that store program codes and data. Processors 930 and 970 can also perform computations to derive frequency and impulse response estimates for the uplink and downlink, respectively.

It is to be understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof. For a hardware implementation, the processing units may be implemented within one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), processors, controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described herein, or a combination thereof.

When the embodiments are implemented in software, firmware, middleware or microcode, program code or code segments, they may be stored in a machine-readable medium, such as a storage component. The code segment may represent: a procedure, function, subprogram, program, routine, subroutine, module, software package, class, or any combination of instructions, data structures, or program statements. A code segment may be coupled to another code segment or a hardware circuit by passing and/or receiving information, data, arguments, parameters, or memory contents. Information, arguments, parameters, data, etc. may be passed, forwarded, or transmitted using any suitable means including memory sharing, message passing, token passing, network transmission, etc.

For a software implementation, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The software codes may be stored in memory units and executed by processors. The memory unit may be implemented within the processor or external to the processor, in which case it can be communicatively coupled to the processor via various means as is known in the art.

Referring to fig. 10, illustrated is a system 1000 that facilitates generating an interference indication to be broadcast to a plurality of mobile devices. For example, system 1000 can reside at least partially within a base station. It is to be appreciated that system 1000 is represented as including functional blocks, which can be functional blocks that represent functions implemented by a processor, software, or combination thereof (e.g., firmware). System 1000 includes a logical grouping 1002 of electrical components that can act in conjunction. For instance, logical grouping 1002 can include an electrical component for providing power control information in an assignment 1004. For example, minimum and maximum CoT values may be included in the allocation to enable setting of a range for delta-based power control. Although these parameters are assigned by the base station 80, it should be appreciated that these parameters are not necessarily assigned by the same mechanism or at the same time. For example, the step size and the minimum/maximum CoT value may be semi-static parameters that need not be assigned for each packet or assignment. These parameters may be updated by higher layer messages or the like whenever an update is required. Moreover, logical grouping 1002 can include an electrical component for broadcasting an interference offset value 1006. For example, an interference offset value may be broadcast for each subband and represent the IoT level observed for the subband. Moreover, logical grouping 1002 can include an electrical component for broadcasting an other sector interference indication 1008. According to an example, the other-sector interference indication can include a regular OSI indication that enables slow delta value estimation. The slow delta value may be used as a suggested value for mobile device assignment. In addition, OSI indications can include fast OSI indications that provide an indication of transmission interference on a subband. Fast OSI indication enables adjustment of transmit delta values. Additionally, system 1000 can include a memory 1010 that retains instructions for executing functions associated with electrical components 1004, 1006, and 1008. While shown as being external to memory 1010, it is to be understood that one or more of electrical components 1004, 1006, and 1008 can exist within memory 1010.

Turning to fig. 11, illustrated is a system 1100 that adjusts power on a reverse link. System 1100 can reside within a mobile device, for instance. As depicted, system 1100 includes functional blocks that can represent functions implemented by a processor, software, or combination thereof (e.g., firmware). System 1100 includes a logical grouping 1102 of electrical components that facilitate controlling forward link transmissions. Logical grouping 1102 can include an electrical component for establishing an increment value range 1104. For example, a slow delta value range or a transmit delta value range may be set based on consideration of power control information in the allocation and/or interference offset values broadcast by the serving base station. Moreover, logical grouping 1102 can include an electrical component for evaluating an adjustment to the delta value 1106. For example, the slow delta value can be adjusted based on consideration of the broadcast regular OSI indication. Additionally, the transmit delta value can be adjusted based in part on the fast OSI indication. Moreover, logical grouping 1102 can include an electrical component for setting a power spectral density 1108. For example, where the adjustment to the transmit delta value is estimated, the PSD of the reverse link traffic channel can be set based on the new delta value. Additionally, system 1100 can include a memory 1110 that retains instructions for executing functions associated with electrical components 1104, 1106, and 1108. While shown as being external to memory 1110, it is to be understood that electrical components 1104, 1106, and 1108 can exist within memory 1110.

What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the described embodiments are intended to embrace all such alterations, modifications and variations that fall within the spirit and scope of the appended claims. Furthermore, to the extent that the term "includes" is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when employed as a transitional word in a claim.

Claims (75)

1. A method that facilitates reverse link traffic channel power control, comprising:

providing power control information in the allocation;

broadcasting an interference offset value for each subband used to establish an adjustment range; and

other Sector Interference (OSI) indications for adjusting the power control value are broadcast.

2. The method of claim 1, further comprising: allocating a mobile device on a reverse link traffic channel using the allocation including power control information.

3. The method of claim 1, wherein the power control information comprises at least one of: a minimum carrier over thermal noise (CoT) value, a maximum CoT value, a target carrier to interference (C/I) value, or a power adjustment step size.

4. The method of claim 1, wherein the OSI indication is a regular OSI indication for slow delta value adjustment.

5. The method of claim 4, wherein broadcasting the indication comprises: the regular OSI indication is broadcast every superframe.

6. The method of claim 1, wherein the OSI indication is a fast OSI indication used to adjust transmit delta values.

7. The method of claim 6, wherein broadcasting the indication comprises: broadcasting the fast OSI indication for each sub-band on each reverse link frame.

8. The method of claim 1, wherein the interference offset is an indication of an interference over thermal noise ratio (IoT) level for each subband.

9. A wireless communications apparatus, comprising:

a memory holding instructions related to: broadcasting an interference offset value for each subband, broadcasting a regular Other Sector Interference (OSI) parameter, and broadcasting a fast OSI parameter; and

a processor, coupled to the memory, for executing the instructions retained in the memory.

10. The wireless communications apparatus of claim 9, wherein broadcasting regular OSI parameters comprises: the parameters are included in the preamble of each superframe.

11. The wireless communications apparatus of claim 9, wherein broadcasting the fast OSI parameters comprises: broadcasting the parameters for each sub-band.

12. A wireless communications apparatus that facilitates delta-based power control, comprising:

means for providing power control information in an allocation of a mobile device;

means for broadcasting an interference offset value for each subband; and

means for broadcasting an Other Sector Interference (OSI) indication that enables delta-based power control.

13. The wireless communications apparatus of claim 12, further comprising: means for allocating a mobile device on a reverse link traffic channel using the allocation including power control information.

14. The wireless communications apparatus of claim 12, wherein the power control information includes at least one of: a minimum carrier over thermal noise (CoT) value, a maximum CoT value, a target carrier to interference (C/I) value, or a power adjustment step size.

15. The wireless communications apparatus of claim 12, wherein the OSI indication is a regular OSI indication for slow delta value adjustment.

16. The wireless communications apparatus of claim 15, wherein broadcasting the indication comprises: the regular OSI indication is broadcast every superframe.

17. The wireless communications apparatus of claim 12, wherein the OSI indication is a fast OSI indication utilized to adjust transmit delta values.

18. The wireless communications apparatus of claim 17, wherein broadcasting the indication comprises: broadcasting the fast OSI indication for each sub-band.

19. The wireless communications apparatus of claim 12, wherein the interference offset is an indication of an interference over thermal noise ratio (IoT) level for each subband.

20. A machine-readable medium having stored thereon machine-executable instructions for:

providing power control information in the allocation;

broadcasting an interference offset value for each subband used to establish an adjustment range; and

other Sector Interference (OSI) indications for adjusting the power control value are broadcast.

21. The machine-readable medium of claim 20, further comprising: instructions for allocating a mobile device on a reverse link traffic channel using the allocation including power control information.

22. The machine-readable medium of claim 20, wherein the power control information comprises at least one of: a minimum carrier over thermal noise (CoT) value, a maximum CoT value, a target carrier to interference (C/I) value, or a power adjustment step size.

23. The machine-readable medium of claim 20, wherein the OSI indication is a regular OSI indication for slow delta value adjustment.

24. The machine-readable medium of claim 23, wherein broadcasting the indication comprises: the regular OSI indication is broadcast every superframe.

25. The machine-readable medium of claim 20, wherein the OSI indication is a fast OSI indication used to adjust transmit delta values.

26. The machine-readable medium of claim 25, wherein broadcasting the indication comprises: broadcasting the fast OSI indication for each sub-band on each reverse link frame.

27. The machine-readable medium of claim 20, wherein the interference offset is an indication of an interference over thermal noise ratio (IoT) level for each subband.

28. In a wireless communication system, an apparatus comprising:

an integrated circuit to:

assigning a reverse link traffic channel to the mobile device;

providing information related to power control in the allocation; and

regular Other Sector Interference (OSI) indications and fast Other Sector Interference (OSI) indications are broadcast to at least one mobile device to facilitate delta-based power control.

29. A method of implementing delta-based power control, comprising:

establishing an allowed range of delta values based in part on information related to power control included in the allocation;

estimating an adjustment to the delta value based in part on a broadcasted Other Sector Interference (OSI) indication; and

setting a power spectral density corresponding to a reverse link traffic channel according to the delta value.

30. The method of claim 29, further comprising: the feedback is transmitted to the serving base station.

31. The method of claim 30, wherein the feedback comprises at least one of: a buffer size, a quality of service (QoS) level, a maximum allowed power, a power headroom, or the delta value.

32. The method of claim 29, wherein the power control related information comprises at least one of: a minimum carrier over thermal noise (CoT) value, a maximum CoT value, a target carrier to interference (C/I) value, or a power adjustment step size.

33. The method of claim 29, wherein the delta value is a slow delta value and the OSI indications are regular OSI indications.

34. The method of claim 33, further comprising: the slow delta value is maintained and adjusted every superframe according to the regular OSI indication.

35. The method of claim 34, wherein the maintaining and adjusting further comprises: an OSI monitoring set is generated that includes sectors that can be acquired.

36. The method of claim 35, wherein generating the OSI monitoring set comprises: a threshold is applied to a forward link geometry of the sector.

37. The method of claim 29, wherein the delta value is a transmit delta value and the OSI indications are fast OSI indications.

38. The method of claim 37, wherein establishing a range comprises: the allowed range is also based on an interference offset value broadcast by the serving base station.

39. The method of claim 37, further comprising: maintaining and adjusting the transmit delta value, the maintaining and adjusting including initializing the transmit delta value to a maximum value for each allocation.

40. The method of claim 37, further comprising: the transmit delta value is incremented when all fast OSI indications indicate no interference.

41. The method of claim 37, further comprising: the transmit delta value is gradually decreased when any of the fast OSI indications indicate that interference is present.

42. A wireless communications apparatus, comprising:

a memory holding instructions related to: establishing an allowed range for a delta value based in part on information included in the allocation relating to power control, estimating an adjustment to the delta value based in part on the broadcasted OSI indication, and setting a power spectral density corresponding to a reverse link traffic channel according to the delta value;

an integrated circuit coupled to the memory for executing the instructions held in the memory.

43. A wireless communications apparatus that enables delta-based power control, comprising:

means for establishing an allowed range of delta values based in part on information related to power control included in the allocation;

means for estimating an adjustment to the delta value based in part on the broadcasted OSI indication; and

means for setting a power spectral density corresponding to a reverse link traffic channel according to the delta value.

44. The wireless communications apparatus of claim 43, further comprising: means for transmitting the feedback to a serving base station.

45. The wireless communications apparatus of claim 44, wherein the feedback comprises at least one of: a buffer size, a quality of service (QoS) level, a maximum allowed power, a power headroom, or the delta value.

46. The wireless communications apparatus of claim 43, wherein the power control related information comprises at least one of: a minimum carrier over thermal noise (CoT) value, a maximum CoT value, a target carrier to interference (C/I) value, or a power adjustment step size.

47. The wireless communications apparatus of claim 43, wherein the delta value is a slow delta value and the OSI indications are regular OSI indications.

48. The wireless communications apparatus of claim 47, further comprising: means for maintaining and adjusting the slow delta value per superframe in accordance with the regular OSI indication.

49. The wireless communications apparatus of claim 48, wherein means for maintaining and adjusting further comprises: means for generating an OSI monitor set including sectors that can be acquired.

50. The wireless communications apparatus of claim 49, further comprising: a first OSI monitoring set for regular OSI indications and a second OSI monitoring set for fast OSI indications are generated.

51. The wireless communications apparatus of claim 50, wherein the second OSI monitoring set is restricted to members of an active set.

52. The wireless communications apparatus of claim 49, wherein means for generating the OSI monitoring set comprises: a threshold is applied to a forward link geometry of the sector.

53. The wireless communications apparatus of claim 49, wherein means for generating the OSI monitoring set comprises: a threshold is applied to the channel difference for the sector.

54. The wireless communications apparatus of claim 43, wherein the delta value is a transmit delta value and the OSI indications are fast OSI indications.

55. The wireless communications apparatus of claim 54, wherein means for establishing a range comprises: the allowed range is also based on an interference offset value broadcast by the serving base station.

56. The wireless communications apparatus of claim 54, further comprising: means for maintaining and adjusting the transmit delta value, the maintaining and adjusting comprising initializing the transmit delta value to a maximum value for each allocation.

57. The wireless communications apparatus of claim 54, further comprising: means for incrementally increasing the transmit delta value when all fast OSI indications indicate no interference.

58. The wireless communications apparatus of claim 54, further comprising: means for progressively decreasing the transmit delta value when any of the fast OSI indications indicate the presence of interference.

59. A machine-readable medium having stored thereon machine-executable instructions for:

establishing an allowed range of delta values based in part on information related to power control included in the allocation;

estimating an adjustment to the delta value based in part on a broadcasted Other Sector Interference (OSI) indication; and

setting a power spectral density corresponding to a reverse link traffic channel according to the delta value.

60. The machine-readable medium of claim 59, further comprising: instructions for transmitting the feedback to the serving base station.

61. The machine-readable medium of claim 59, wherein the feedback comprises at least one of: a buffer size, a quality of service (QoS) level, a maximum allowed power, a power headroom, or the delta value.

62. The machine-readable medium of claim 59, wherein the power control related information comprises at least one of: a minimum carrier over thermal noise (CoT) value, a maximum CoT value, a target carrier to interference (C/I) value, or a power adjustment step size.

63. The machine-readable medium of claim 59, wherein the delta value is a slow delta value and the OSI indications are regular OSI indications.

64. The machine-readable medium of claim 63, further comprising: instructions for maintaining and adjusting the slow delta value per superframe in accordance with the regular OSI indication.

65. The machine-readable medium of claim 64, wherein the maintaining and adjusting further comprises: an OSI monitoring set is generated that includes sectors that can be acquired.

66. The machine-readable medium of claim 65, further comprising: a first OSI monitoring set for regular OSI indications and a second OSI monitoring set for fast OSI indications are generated.

67. The machine-readable medium of claim 66, wherein the second OSI monitoring set is restricted to members of an active set.

68. The machine-readable medium of claim 65, wherein generating the OSI monitoring set comprises: a threshold is applied to a forward link geometry of the sector.

69. The machine-readable medium of claim 65, wherein generating the OSI monitoring set comprises: a threshold is applied to the channel difference for the sector.

70. The machine-readable medium of claim 59, wherein the delta value is a transmit delta value and the OSI indications are fast OSI indications.

71. The machine-readable medium of claim 70, wherein establishing a range comprises: the allowed range is also based on an interference offset value broadcast by the serving base station.

72. The machine-readable medium of claim 70, further comprising: maintaining and adjusting the transmit delta value, the maintaining and adjusting including initializing the transmit delta value to a maximum value for each allocation.

73. The machine-readable medium of claim 70, further comprising: the transmit delta value is incremented when all fast OSI indications indicate no interference.

74. The machine-readable medium of claim 70, further comprising: the transmit delta value is gradually decreased when any of the fast OSI indications indicate that interference is present.

75. In a wireless communication system, an apparatus comprising:

an integrated circuit to:

establishing an allowed range of delta values based in part on information related to power control included in the allocation;

determining an adjustment to the delta value based in part on a broadcasted Other Sector Interference (OSI) indication; and

setting a power spectral density corresponding to a reverse link traffic channel according to the delta value.