RU2437226C2 - Multiplexing of probing signals in ack-ii and cqi-channels - Google Patents

Abstract

FIELD: information technologies.

SUBSTANCE: it is determined that a unit of resources may include all symbols in a time interval for each subcarrier, which is in general multiple to 12 in the unit of resources, at the same time the time interval typically makes 0.5 millisecond (ms) and includes 7 symbols for a short cyclic prefix (CP) and 6 symbols for a long CP; also the unit of resources may include an SRS-channel and other channels, such as a channel of acknowledgement (ACK) and a channel quality indicator (CQI). Even though the SRS is specified as a separate physical channel, it may be multiplexed with upperlink channels. Accordingly the SRS may be detected in a subframe time interval of 1.0 ms, making two time segments, besides, typically one time interval, but not the other one, includes the SRS. The structure of time interval may be modified so that multiplexing is simplified, for instance, replacement of the existing symbol with the SRS and length and type of an orthogonal code of spectrum expansion in the time area may be determined for each time interval as the function of the SRS presence.

EFFECT: increased throughput capacity.

48 cl, 16 dwg

Description

Cross reference to related applications

This application claims the priority of provisional application US No. 60 / 944,779, entitled "METHODS AND APPARATUSES FOR MULTIPLEXING OF UPLINK SOUNDING SIGNALS, ACK AND CQI CHANNELS IN THE WIRELESS COMMUNICATION SYSTEM", which was filed June 18, 2007. This application claims the priority of provisional application US No. 60/945,076, entitled "METHODS AND APPARATUSES FOR MULTIPLEXING OF UPLINK SOUNDING SIGNALS, ACK AND CQI CHANNELS IN THE WIRELESS COMMUNICATION SYSTEM", which was filed June 19, 2007. The above applications are fully incorporated herein by reference.

FIELD OF THE INVENTION

The following description generally relates to wireless communications, and more specifically to uplink sounding resource signaling (SRS) multiplexing in an acknowledgment channel (ACK) or channel quality indicator channel (CQI) in a wireless communication system.

State of the art

Wireless communication systems are widely deployed to provide various types of communication, for example, voice and / or data can be transmitted through such wireless communication systems. A typical wireless communication system or network may provide multiple users with access to one or more shared resources (e.g., bandwidth, transmit power, etc.). For example, a system can use many multiple access techniques, such as frequency division multiplexing (FDM), time division multiplexing (TDM), code division multiplexing (CDM), orthogonal frequency division multiplexing (OFDM), etc.

In general, multiple access wireless communication systems can support simultaneous communication for multiple access terminals. Each access terminal can exchange data from one or more base stations through transmission on the forward and reverse links. The forward communication line (or downlink) refers to the communication line from base stations to access terminals, and the reverse communication line (or uplink) refers to the communication line from access terminals to base stations. Such a communication line can be established through a system with one input and one output, with multiple inputs and one output, or with multiple inputs and multiple outputs (MIMO).

. Каждый из N _S независимых каналов соответствует измерению. MIMO-система может обеспечивать повышенную производительность (к примеру, более высокую пропускную способность и/или большую надежность), если используются дополнительные размерности, созданные посредством нескольких передающих и приемных антенн.A MIMO system uses multiple (N _T ) transmit antennas and multiple (N _R ) receive antennas for data transmission. A MIMO channel formed by N _T transmit and N _R receive antennas can be decomposed into N _S independent channels, which are also referred to as spatial channels, where

. Each of the N _S independent channels corresponds to a measurement. A MIMO system can provide increased performance (for example, higher throughput and / or greater reliability) if additional dimensions created using several transmit and receive antennas are used.

The MIMO system supports time division duplex (TDD) and frequency division duplex (FDD) systems. In a TDD system, forward and reverse link transmissions are in the same frequency domain, so the reversibility principle provides an opportunity to estimate a forward link channel from a reverse link channel. This allows the access point to benefit from the formation of transmission beams in a forward link when multiple antennas are available at the access point.

Wireless communication systems often use one or more base stations that provide coverage. A typical base station may transmit multiple data streams for broadcast, multicast and / or unicast services, while the data stream may be a data stream that may be of particular interest for reception via a mobile terminal. An access terminal within the coverage area of such a base station may be used to receive one, many or all data streams carried by a composite stream. Similarly, an access terminal may transmit data to a base station or other access terminal.

Recently, a sounding resource channel (SRS) channel has been introduced as a broadband pilot channel. An SRS channel is an orthogonal channel configured to provide frequency selective scheduling, for example, for physical channels, and act as a reference signal for closed loop power control. In general, an SRS channel is a separate physical channel that is assigned to each terminal or user device by transmitting Layer 3 (L3) signaling. Accordingly, the SRS channel is different from other channels included in the resource block.

Disclosure of invention

The following is a simplified summary of one or more embodiments in order to provide a basic understanding of these embodiments. This entity is not a comprehensive overview of all considered embodiments, and it does not intend either to identify key or critical elements of all embodiments, or to describe 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 an introduction to the more detailed description that is presented later.

In accordance with one or more embodiments and their corresponding disclosure, various aspects are described in connection with the simplification of sounding resource signal multiplexing (SRS) in a wireless communication environment. A resource block may include all symbols in a time interval for each, in general, a multiple of 12, a subcarrier in the resource block. The time interval is typically 0.5 milliseconds (ms) and includes 7 characters for a short cyclic prefix (CP) and 6 characters for a long CP. The resource block may include an SRS channel, as well as other channels, such as an acknowledgment channel (ACK) and a channel quality indicator (CQI) channel. Although the SRS is defined as a separate physical channel, the SRS can be multiplexed with uplink channels. Accordingly, SRS can be detected in a 1.0 ms subframe time interval of two time segments, typically one time interval, but not the other, includes SRS. The structure of the time interval can be modified to simplify multiplexing, for example, replacing an existing symbol with SRS and the length and type of the orthogonal spreading code in the time domain can be determined for each time interval as a function of the presence of SRS.

According to related aspects, a method is described herein that facilitates multiplexing an SRS channel in a wireless communication environment. The method may include the step of detecting an SRS symbol in a time interval of a subframe. Additionally, the method may include the step of modifying the channel structure for at least one time interval in a subframe. In addition, the method may also include the step of determining the length and type of the orthogonal spreading code in the time domain to apply to the time segments of the subframe as a function of the presence of SRS. Additionally, the method may comprise applying a specific spreading code to a channel of at least one time interval in a subframe.

Another aspect relates to a wireless communication device. A wireless communication device may include a storage device that stores instructions related to detecting an SRS symbol in a time interval of a subframe, calculating the type and length of an orthogonal spreading code in a time domain to apply to time segments of a subframe, based on the presence of SRS in the interval time, modifying the channel structure for one or more time intervals in the subframe, implementing the calculated spreading code for the channel of one or more time intervals in the subframe. Additionally, the wireless communication device may include a processor coupled to the storage device, configured to implement instructions stored in the storage device.

Another aspect relates to a wireless communications apparatus that enables multiplexing of an SRS channel in a wireless communications environment. A wireless communication device may include means for detecting an SRS symbol in a time interval of a subframe. Additionally, the wireless communication device may include means for utilizing the presence of the SRS to determine the type and length of the orthogonal time domain spreading code to apply in one or more time slots of a subframe. In addition, the wireless communication device may include means for adjusting the channel structure for at least one time interval in a subframe. Additionally, the wireless communication device may include means for applying a specific spreading code to at least one time segment in a subframe.

Another other aspect relates to a computer program product (also referred to as computer-readable media) storing code (also referred to as computer-executable instructions) for detecting an SRS symbol in a time interval of a subframe on; determining both the type and length of the time domain orthogonal spreading code to apply to one or more time slots of a subframe as a function of the presence of SRS in one or more time slots; changing the channel structure for a time interval including SRS; and using a specific spreading code for at least one time interval in a subframe.

In accordance with yet another aspect, an apparatus in a wireless communication system may include a processor, wherein the processor may be configured to detect an SRS symbol in a time interval of a subframe. In addition, the processor may be configured to calculate the type and length of the orthogonal spreading code in the time domain to apply to one or more time slots of a subframe, the spreading code being computed as a function of the presence of SRS in one or more time slots of the subframe. Additionally, the processor may be configured to modify the channel structure of at least one time interval in a subframe. Additionally, the processor may be configured to apply the spreading code to at least one time segment in a subframe.

To the accomplishment of the foregoing and related ends, 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 one or more embodiments. However, these aspects point to only some of the many ways in which the principles of various embodiments can be used, and the described embodiments are intended to include all such aspects and their equivalents.

Brief Description of the Drawings

1 is an illustration of a wireless communication system in accordance with various aspects presented herein.

2A is a diagram that illustrates an example illustration of an SRS structure for a single short cyclic prefix (CP) time slot.

2B is a diagram that illustrates an exemplary SRS structure for a single long CP slot.

3 is an illustration of an example system that can facilitate multiplexing of SRSs in a wireless environment.

4A is an illustration of an example subframe 400 explaining multiplexing of an acknowledgment channel (ACK) in the absence of a probing RS.

4B is an illustration of an example subframe 430 explaining ACK channel multiplexing when a probing RS is present and an ACK symbol is replaced.

4C is an illustration of an example subframe illustrating ACK channel multiplexing when a probing RS is present and the RS symbol is replaced.

5A is an illustration of a nominal exemplary subframe 500 explaining multiplexing of a CQI channel in the absence of a probing RS.

5B is an illustration of an example subframe explaining multiplexing of a CQI channel when a probing RS is present and a CQI symbol is replaced.

5C is an illustration of an example subframe block illustrating CQI channel multiplexing when a probing RS is present and the RS symbol is replaced.

6 is an illustration of an example technology for simplifying SRS multiplexing in a wireless environment.

7 is an illustration of an example technology that simplifies various further aspects of modifying a channel structure for multiplexing SRSs in a wireless environment.

8 is an illustration of an example access terminal that facilitates multiplexing an SRS channel in a wireless environment.

9 is an illustration of an example base station that facilitates multiplexing of SRSs in a wireless communication environment.

10 is an illustration of an example wireless network environment that can be used in conjunction with various systems and methods described herein.

11 is an illustration of an example electrical component system that enables multiplexing of an SRS channel in a wireless environment.

The implementation of the invention

Various embodiments will now be described with reference to the drawings, in which like reference numerals are used to refer to like elements. In the following description, for purposes of explanation, many specific details are set forth in order to provide a thorough understanding of one or more embodiments. However, it may be obvious that these embodiments can be practiced without these specific details. In other instances, common structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

When used in this application, the terms "component", "module", "system", etc. are intended to refer to an object connected to a computer, or hardware, firmware, a combination of hardware and software, software, or software during execution. For example, a component may be, but not limited to, a process running on a processor, 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 a computing device may be a component. One or more components may be stored within a process and / or thread of execution, and the component may be localized on a computer and / or distributed between two or more computers. In addition, these components can be executed from various computer-readable media storing various data structures. Components can exchange data through local and / or remote processes, for example, in accordance with a signal having one or more data packets (for example, data from one component interacting with another component in a local system, distributed system and / or network, for example over the Internet, with other systems through a signal).

Moreover, various embodiments are described herein in connection with an access terminal. An access terminal may also be called a system, subscriber module, subscriber station, mobile station, mobile module, remote station, remote terminal, mobile device, user terminal, terminal, wireless device, user agent, user device, or user equipment (UE). The access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) telephone, a wireless subscriber access station (WLL), a personal digital assistant (PDA), a wireless handheld device, a computing device or other processing device, connected to a wireless modem. In addition, various embodiments are described herein in connection with a base station. A base station may be used to communicate with access terminal (s) and may also be referred to as an access point, Node B, Enhanced Node B, or some other terminology.

Moreover, various aspects or features described herein may be implemented as a method, device, or product using standard programming and / or development techniques. The term “product,” as used herein, is intended to comprise a computer program accessible from any computer-readable device, medium, or medium. For example, computer-readable media can include, but not limited to, magnetic storage devices (e.g., hard disk, floppy disk, magnetic tape, etc.), optical disks (e.g., compact disc (CD), universal digital disk (DVD), etc.), smart cards and flash memory devices (for example, EPROM, card, card, flash drive, etc.). Additionally, the various storage media described herein may represent one or more devices and / or other computer-readable media for storing information. The term “computer-readable medium” may include, without limitation, wireless channels and various other media capable of storing, hosting and / or transferring commands (s) and / or data.

1, a wireless communication system 100 is illustrated in accordance with various embodiments presented herein. System 100 comprises a base station 102, which may include multiple antenna groups. For example, one antenna group may include antennas 104 and 106, another group may comprise antennas 108 and 110, and an additional group may include antennas 112 and 114. Two antennas are illustrated for each antenna group; however, more or fewer antennas can be used for each group. The base station 102 may additionally include a chain of transmitting devices and a chain of receiving devices, each of which, in turn, may contain many components associated with the transmission and reception of signals (for example, processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.) that should be recognized by specialists in this field of technology.

Base station 102 may communicate with one or more access terminals, such as access terminal 116 and access terminal 122; however, it should be appreciated that base station 102 can exchange data with virtually any number of access terminals, like access terminals 116 and 122. Access terminals 116 and 122 may be, for example, cell phones, smartphones, laptop computers, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs and / or any other suitable device for exchanging data via wireless communication system 100. As illustrated, the access terminal 116 communicates with antennas 112 and 114, while the antennas 112 and 114 transmit information to the access terminal 116 on the forward link 118 and receive information from the access terminal 116 on the reverse link 120. In addition, the access terminal 122 communicates with antennas 104 and 106, while the antennas 104 and 106 transmit information to the access terminal 122 on the forward link 124 and receive information from the access terminal 122 on the reverse link 126. In a frequency division duplex (FDD) system, for example, forward link 118 may use a frequency band other than that used by reverse link 120, and forward link 124 may use a frequency band other than that used by reverse link 126. Additionally, in a time division duplex (TDD) system, forward link 118 and reverse link 120 may use a common frequency band, and forward link 124 and reverse link 126 may use a common frequency band.

Each group of antennas and / or the area in which they are intended to exchange data can be referred to as a sector of the base station 102. For example, groups of antennas can be configured to communicate with access terminals by devices in the sector of the areas covered by the base station 102. When communicating over For forward links 118 and 124, transmitting antennas of base station 102 may use beamforming to improve the signal-to-noise ratio of forward links 118 and 124 for access terminals 116 and 122. In addition, although base station 102 uses beamforming to transmit access terminals 116 and 122 randomly distributed over associated coverage, access terminals in neighboring cells may be less affected than transmitting the base station through one antenna to all their access terminals.

Base station 102, access terminal 116 and / or access terminal 122 may be a wireless transmitter and / or wireless receiver at this time. When sending data, the wireless transmitter can use one or more channels, such as a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), a sounding resource signal channel (SRS), etc. An SRS channel is an orthogonal broadband pilot channel defined for two different purposes. First, SRS can provide frequency selective scheduling, for example, for physical channels. Secondly, the SRS can act as a reference signal for closed loop power control. In general, an SRS is a separate physical channel that is assigned to each access terminal 116, 122 or other subscriber unit via Layer 3 (L3) signaling. Accordingly, any suitable component or device may periodically transmit the associated SRS at a configurable frequency. A brief overview of the SRS structure can be found with reference to FIGS. 2A and 2B.

2A is a diagram 200 illustrating an SRS structure for a single short cyclic prefix (CP) time slot. As illustrated, the time interval is 0.5 milliseconds (ms) along the time axis 202, with the frequency 204 being represented in the direction of the Y axis so that data or channels at the top of the circuit 200 are transmitted at higher frequencies. Provided that a short CP is used in this example, a time interval of 0.5 ms includes 7 orthogonal frequency division multiplexing (OFDM) symbols. In general, two adjacent 0.5 ms time segments make up a 1.0 ms subframe (not shown), with 10 subframes making up a 10 ms frame. A resource block (not shown) may be the number of characters in a time interval that is a multiple of the number of subcarriers, typically a multiple of 12.

Typically, one symbol of localized frequency division multiplexing (LFDM) in every N subframes is reserved for SRS 206. Thus, SRS 206 can exist as one of these 7 characters in a 0.5 ms time interval illustrated for convenience here and in the other drawings described herein as the first character, however, it should be appreciated that the SRS 206 may be in other locations in a time interval. PUCCH 208 may be a high frequency channel, while PUCCH 210 may be a low frequency channel, and PUSCH is referred to as reference 212.

SRS 206 can be time division multiplexed with PUCCH 208, 210 and / or PUSCH 212. Thus, various SRS parameters can be transmitted in channel overheads, such as Zadova-Chu base sequences (ZC), specific cyclic shift, band range transmittance, time and / or frequency hopping structure, etc.

2B is a diagram 220 that illustrates an SRS structure for a single time slot with a long CP. Note that the circuit 220 is almost similar to the circuit 200 of FIG. 2A, while the dimensions of time 222 and frequencies 224 are shown along the X axis and the Y axis, respectively, and SRS 226 is allocated to one of the symbols in a time interval of 0.5 ms, covering all uplink channels 228-232. However, one difference is that for a long CP, typically 6 characters are provided for each 0.5 ms time slot, rather than 7 characters provided for a short CP. For ease of understanding, the rest of this document provides examples of a relatively short CP, with the full structure provided in connection with FIG. 2A, but it should be understood that the claimed invention is applicable to other CPs, such as, for example, a long CP, as well as to other SRS structures.

3, illustrated is a system 300 that can facilitate multiplexing of SRSs in a wireless communication environment. System 300 may include a wireless device 302, which is shown as transmitting data through a channel 304. Although the wireless device 302 is illustrated as transmitting data, it can also receive data through a channel 304 (for example, wireless device 302 can simultaneously transmit and receive data, the wireless device 302 can transmit and receive data at different times, a combination of the above, etc.), for example, by means of a receiver 306 and a transmitter 308. The wireless property 302, for example, can be a base station (for example, base station 102 of FIG. 1, etc.), an access terminal (for example, access terminal 116 of FIG. 1, access terminal 122 of FIG. 1 etc. It should also be appreciated that the wireless communications device 302 can be associated with multiple channels over which data can be transmitted and / or received, although only one channel is illustrated here. In addition, channel 304 may generalize many channels with different structures suitable for general or specific purposes, for example, the physical uplink channels described in FIGS. 4A-5C, which may be referred to in conjunction with FIG. 3, to illustrate various features wireless communication devices 302, as well as features of other components or devices described herein.

4A illustrates an example subframe 400 explaining multiplexing of an acknowledgment channel (ACK) in the absence of a probing RS. Subframe 400 represents 1.0 ms of time 418, with the frequency dimension 430 shown as the Y axis, which can be divided into two 0.5 ms time segments similar to the channel structure with time segment 200 schematically shown in FIG. 2A when used short CP, and 7 characters in the time interval are included in the resource block. However, unlike the time interval 200, in this case, the probing RS is not present in any time interval of the subframe 400. At the top of the first 0.5 ms time interval, four ACK symbols 402 and three symbols 404 of the reference signal are illustrated ( RS). RS symbols 404 are a pilot structure generally used to demodulate an ACK channel or other associated channel. Typically, the characters ACK 402 and RS 404 are transmitted in the PUCCH areas. Thus, the relationship with the structures illustrated in FIGS. 2A and 2B can be easily taken into account (for example, PUCCH 208, 210, 228, 230).

In general, resources for the PUSCH 422 are allocated based on the subframe, and the transmission frequency 420 may abruptly change from a subframe to a subframe (for example, from a subframe 400 to another subframe). In contrast, a PUCCH that can carry ACK and RS information (as well as channel quality indicator (CQI), negative reception (NACK), hybrid automatic retransmission request (HARQ), uplink scheduling requests, etc.) can change stepwise at the boundaries of time intervals, in order, for example, to provide greater reliability. Thus, the boundary between the first time segment of 0.5 ms and the second time segment of 0.5 ms can act as the boundary of the transmission frequency for frequency hopping in the PUCCH. Accordingly, a particular group of users associated with data from the ACK 402 and RS 404 transmitted at the top of the frequency spectrum 420 in the first time interval can jump to the lower frequency 420 in the second time interval, as illustrated by ACK 406 and RS 408. Similarly, another group of users associated with ACK 414 and RS 416 in the first time interval can jump to the upper part of the spectrum in the second time interval to ACK 410 and RS 412. Associated relationships between ACK and RS symbols are shown using the white and black backgrounds, respectively.

Accordingly, the PUCCH nominal structure for short CP provides 18 ACK per resource block. This 18 ACK can distinguish 6 cyclic frequency division multiplexing (CDM) cyclic shifts for each of the 3 time domain CDM orthogonal coatings. For a long CP, the PUCCH nominal structure provides 8 ACKs per resource block to account for 4 CDM cyclic shifts in the time domain for each of the 2 orthogonal CDM coverages in the time domain.

4B, an exemplary subframe 430 illustrating ACK channel multiplexing when a probing RS is present and an ACK symbol is replaced is illustrated. As in the case of the subframe 400 of FIG. 4A, the frequency 452 is represented in the dimension of the Y axis, and the subframe 430 represents 1.0 ms of time 450, which can be divided into two 0.5 ms time segments, each with a channel structure similar to that described on Figa, with 7 characters per interval, as specified for short CP. However, in this case, the second time interval does not include the probing RS, as illustrated by the time interval 200. SRS 432 is illustrated in the first position in the first time interval of 0.5 ms, however, it should be recalled that SRS 432 may exist in other locations in a time interval, as well as in a different time interval of a subframe 430. In addition, SRS 432 may also exist in a long CP structure, although for brevity and in order to facilitate a quick understanding of the principles explained in this document, only short CP and uses to illustrate.

Unlike the exemplary nominal subframe 400 of FIG. 4A, the first time interval in subframe 430 includes three ACK symbols 434, 446, rather than four ACK symbols 402, 414, while the first time interval still includes the same number of RS-characters is 436, 448, i.e. three. The reason for the smaller number of ACK characters is due to the presence of SRS 432, which takes into account one of the 7 characters in the short CP time interval. In this case, SRS 432 replaced one of the four ACK symbols 402, 414 present in the subframe 400, so that there are only three ACK symbols 434, 446 in the first time interval of the subframe 430. In the second time interval of 0.5 ms subframe 430 probing RS is not present, so the channel structure has not changed. Accordingly, four ACK symbols 438, 442 and three RS symbols 440, 444 are present in the same manner as in the second time interval of the exemplary subframe 400 illustrated in FIG. 4A.

In FIG. 4C, an example subframe 460 is illustrated explaining ACK multiplexing when a probing RS is present and the RS symbol is replaced. Again, similar to the subframe 400 of FIG. 4A, the frequency 482 is also represented along the Y axis, and the subframe 460 represents 1.0 ms of time 480, as illustrated in the dimension of the X axis. The 1.0 ms interval can be divided into two time segments of 0 , 5 ms, each of which is similar to the channel structure described in FIG. 2A, with 7 symbols per slot (e.g., short CP), but only one slot in subframe 460 includes a probing RS. Similar to the subframe 430 of FIG. 4B, the SRS 462 is also shown in the first position of the first 0.5 ms time slot. However, in this case, the first 0.5 ms time slot of the subframe 460 stores four ACK symbols 464, 476, and includes only two RS symbols 466, 478, which is one less than in the first intervals time of the subframes 400, 430. Thus, in this case, the RS symbol is replaced by the SRS 462 instead of the ACK symbol, as was the case in the subframe 430. However, similarly to the subframe 430, changes in the structure of the second time interval are not compared with what is illustrated in the nominal subframe 400, as shown by four ACK symbols 468, 472 and three RS symbols 470, 474 in a second 0.5 ms time slot of subframe 460.

5A is a nominal exemplary subframe 500 illustrating CQI channel multiplexing in the absence of a probing RS. Subframe 500 represents 1.0 ms of time, which can be divided into two 0.5 ms time segments similarly to the channel structure described in FIG. 2A, without probing RS in any time interval. At the top of the first 0.5 ms time interval, five CQI symbols 502 and two RS symbols 504 are shown, which are 7 symbols available in the short CP structure. Likewise, five CQI symbols 514 and two RS symbols 516 are provided at the bottom of the frequency spectrum. Although the PUSCH 516 region may abruptly change at the boundaries of subframes, the PUCCH channel may abruptly change at the boundaries of time intervals. Thus, five CQI symbols 506 in the second 0.5 ms time interval correspond to CQI symbols 502, while five CQI symbols 510 correspond to CQI symbols 514. Similarly, RS symbols 504, 516 in the first time interval correspond to RS characters 508, 512, respectively, in a second time interval of subframe 500.

5B, an exemplary subframe 520 is illustrated explaining multiplexing of a CQI channel when a probing RS is present and a CQI symbol is replaced. As in the case of the subframe 500 of FIG. 5A, the subframe 520 represents 1.0 ms of time that can be divided into a first and second time interval, each of 0.5 ms, and each is similar to the short CP structure described in FIG. 2A. however, SRS is provided in only one of these two time intervals and CQI information is transmitted in the PUCCH areas. In this case, there is no probing RS in the second time interval. Also, by way of illustration, the probing RS, SRS 522, is in the first position in the first 0.5 ms time interval, although the SRS 522 may exist elsewhere.

Unlike the exemplary nominal subframe 500 of FIG. 5A, the first time interval in subframe 430 includes four CQI symbols 524 (and four CQI symbols 536 in the low frequencies), rather than five CQI symbols 502 (and 514) in subframe 500. However, the number of RS symbols 526 and 538 remains the same, i.e. two, for each frequency block. In this case, SRS 522 replaces one of the CQI symbols 524, 536 in the first time interval. Otherwise, the second time interval of subframe 520 is almost identical in structure to subframe 500, with five CQI symbols 532, 528 and two RS symbols 534, 530.

FIG. 5C illustrates an example subframe 550 illustrating CQI channel multiplexing when a probing RS is present and the RS symbol is replaced. Also, similarly to the subframe 500 of FIG. 5A, the subframe 550 represents 1.0 ms of time that can be segmented into two 0.5 ms time segments, each similar to the short CP channel structure described in FIG. 2A, with SRS is in only one of the two time slots of the subframe 550. Similar to the subframe 520 of FIG. 5B, the SRS 552 is again shown in the first position of the first 0.5 ms time slot. However, in this case, the first 0.5 ms time interval of subframe 550 stores all five CQI symbols 554, 566, and includes only one RS symbol 556, 568, which is one less than in the first intervals time of subframes 500, 520. Thus, in this case, the RS symbol is replaced by SRS 552, and not by the CQI symbol, as was the case in subframe 520. However, similarly to subframe 520, changes do not occur in the structure of the second interval time compared to that illustrated in the nominal subframe 500, as shown by five CQI symbols 558, 562 and two RS-s mvolov 560, 564 in the second time interval of 0.5 ms subframe 550.

Referring to FIG. 3, the wireless communication device 302 may further include an SRS detector 310 that can detect an SRS symbol in a time interval of a subframe. For example, the SRS detector 310 may detect an SRS symbol, such as one of the subframes 430, 460, 520 or 550 of FIGS. 4B, 4C, 5B, 5C shown in the first 0.5 ms time interval, respectively. If the SRS symbol is not found in the resource block, it is essential that the channel structure should look almost the same as subframes 400 or 500 of FIGS. 4A and 5A, respectively, depending on whether the ACK channel or CQI channel is analyzed and / or multiplexed.

The wireless communications apparatus 302 may also include a structural multiplexer 312 that can modify the channel structure of at least one time slot in a subframe. In particular, the structural multiplexer 312 can multiplex the SRS with an ACK channel or a CQI channel. Thus, when an SRS is detected in a time interval of a subframe by the SRS detector 310, the structural multiplexer 312 can modify the channel structure by replacing one of the symbols in the time interval in which the SRS is detected with an SRS symbol. In one embodiment, the structural multiplexer 312 may modify the channel structure by reducing the number of ACK symbols in a time interval including SRS. This case may be very similar to the transition from subframe 400 to subframe 430, where the SRS 432 of FIG. 4B replaces one of the ACK symbols 402, 414 of the first 0.5 ms time slot of FIG. 4A.

In one embodiment, the structural multiplexer 312 may modify the channel structure by reducing the number of CQI symbols in a time interval including SRS. This case may be substantially similar in nature to the transition from subframe 500 to subframe 520, where the SRS 522 of FIG. 5B replaces one of the CQI symbols 502, 514 of the first 0.5 ms time slot of FIG. 5A. In one embodiment, the structural multiplexer 312 may modify the channel structure by reducing the number of RS symbols in a time interval including SRS. Note that the replacement of the RS-symbol can be carried out either in the ACK channel or in the CQI channel. Accordingly, in one case, this aspect can be almost the same as switching from subframe 400 to subframe 460, where the RS symbol 404, 416 is removed from the first time interval of the ACK channel to allow SRS 462 to be added. In the second case, this aspect can be practically similar to the transition from subframe 500 to subframe 550, where the RS symbol 504, 516 is omitted from the first time interval of the CQI channel to create space for the SRS 552.

In addition, the wireless communication device 302 may include a spreading encoder 314 that can determine the length and type of an orthogonal spreading code in the time domain to apply to the time segments of a subframe as a function of the presence of SRS. Thus, the spreading encoder 314 may determine a different spreading code to apply to the individual time segments of the subframe, based on whether or not the time interval includes the SRS. For specific examples of various cases, reference can be made to Figs. 4B and 4C.

Referring again to FIG. 4B, the first time interval of an ACK channel includes three ACK symbols, three RS symbols, and SRS, which replaced one of the previously existing ACK symbols. The second time interval does not have SRS, four ACK characters, and three RS characters. In one embodiment, the spreading encoder 314 may apply a 3-point discrete Fourier transform (DFT) spreading code in a time interval including SRS (for example, in a first 0.5 ms time interval) for ACK symbols and RS-characters, moreover, a certain length and type are represented by 3-point (for example, length) DFT (for example, type). Since the length and / or type of the orthogonal spreading code in the time domain can be different for time slots without SRS, other spreading codes can be applied to the second time slot in subframe 430. The second time slot in this example includes four ACK symbols and three RS character. In one embodiment, the spreading encoder 314 may apply a 4-point orthogonal spreading code for ACK symbols in a second time interval, wherein the 4-point orthogonal spreading code may be of the Hadamard or DFT type, and may additionally apply a 3-point code DFT spreading to RS-symbols in the second time interval.

It should be noted that although the nominal structure allows the use of 18 ACK per resource block, multiplexing of the SRS and ACK channel may still provide 18 ACK per resource block. Accordingly, any change in ACK multiplexing bandwidth for low Doppler is not necessarily required.

As indicated above, the claimed invention can also be applied to long CP. As an example of such a case, in an embodiment, the spreading encoder 314 may apply in a time interval including SRS, a 3-point DFT spreading code for ACK symbols, and a 2-point orthogonal spreading code (for example, Hadamard or DFT) for RS characters. For the second time interval, the spreading encoder 314 may apply a 4-point orthogonal spreading code for ACK symbols and a 2-point orthogonal spreading code for RS symbols. Although the nominal structure allows 8 ACK per resource block for the long CP structure, the multiplexed channel can still provide 8 ACK per resource block, and thus there is no change in ACK multiplexing bandwidth.

Referring again to FIG. 4C, the first time interval of the ACK channel includes four ACK symbols, two RS symbols, and SRS, which replaced one of the previously existing RS symbols. The second time interval does not have SRS, four ACK characters, and three RS characters. In one embodiment, the spreading encoder 314 may apply a 2-point or 4-point DFT spreading code in a time interval including SRS (for example, a first 0.5 ms time interval) for ACK symbols. In one embodiment, the spreading encoder 314 may apply a 4-point orthogonal spreading code for ACK symbols in a second time interval and further may apply a 3-point DFT spreading code to RS symbols in a second time interval. As with the nominal structure, the multiplexed structure provides 12 ACKs per resource block. A lower ACK multiplexing bandwidth can be provided for a low Doppler value, while it can be optimized for a high Doppler value (for example, SF = 2). In other words, the same multiplexing bandwidth as nominal can be achieved for the configuration SF = 2.

In one embodiment, the aspects described above in which the spreading encoder 314 determines the length and type of the orthogonal spreading code for ACK symbols, and the RS symbols in the ACK channel can be applied to other channels in the PUCCH, such as a CQI channel . Accordingly, spreading coding can determine the length and type of the time-domain orthogonal spreading code for each time interval of subframes 520 and 550 of FIGS. 5B and 5C, respectively, in which structural multiplexer 312 has replaced CQI symbols (e.g., subframe 520) or an RS symbol (e.g., subframe 550). This can be done in a manner substantially similar to that described herein. In the first structure (e.g., subframe 520), where the CQI symbol is replaced by SRS, it should be appreciated that the effective CQI code is increased. In the second structure (for example, subframe 550), where the RS symbol is replaced by SRS, the effective code rate is generally unchanged, and the channel estimation loss may be slightly higher in the first time interval. Additionally, it should be taken into account that 6 CQIs can be transmitted per block of resources in both structures. Accordingly, typically there is no change in CQI multiplexing bandwidth.

6 and 7 illustrate technologies related to increasing the efficiency of multiplexing SRS. Although in order to simplify the explanation of the technology shown and described as a sequence of actions, it is necessary to understand and take into account that the technology is not limited by the order of actions, since some actions can, in accordance with one or more embodiments, be performed in a different order and / or in parallel with actions other than those shown and described in this document. For example, those skilled in the art should understand and take into account that a technology can alternatively be represented as a sequence of interrelated states or events, for example, in a state diagram. Moreover, not all illustrated acts may be used to implement a technology in accordance with one or more embodiments.

6, illustrated is a technology 600 for simplifying SRS multiplexing in a wireless communication environment. At 602, an SRS symbol may be detected in a time interval of a subframe. Typically, a subframe represents 1.0 ms and may consist of two 0.5 ms time slots. SRS can potentially exist in the first or second time interval, but in any case can be detected as existing in the subframe, at a specific location in one of these two time intervals. At 604, the channel structure for at least one time interval in a subframe may be modified. For example, an ACK symbol, a CQI symbol, or an RS symbol may be deleted, and the SRS is added in its place in the time interval where the SRS is detected in block 602.

At 606, the type and length of the time-domain orthogonal spreading code can be determined to apply to the time segments of the subframe, as a function of the presence of the SRS. The type can be, for example, Hadamard or DFT, and the length can be, for example, 2-point, 3-point, 4-point, etc. The time domain type and spreading code for a given time interval can be determined based on whether SRS is present or absent in that particular time interval. At 608, a specific spreading code can be applied to at least one time segment in a subframe.

7, illustrated is a technology 700 that simplifies various further aspects of modifying a channel structure for multiplexing SRSs in a wireless environment. At 702, modifying the channel structure for at least one time interval in a subframe may further comprise reducing the number of ACK symbols in a time interval including SRS. At step 704, in which the modification of the channel structure for at least one time interval in a subframe may further comprise reducing the number of RS symbols in a time interval including SRS. At step 706, in which the modification of the channel structure for at least one time interval in a subframe may further comprise reducing the number of CQI symbols in a time interval including SRS. Note that in each case, the abbreviated symbol in the associated time interval may provide space for the SRS.

FIG. 8 is an illustration of an access terminal 800 that facilitates multiplexing an SRS channel in a wireless environment. Access terminal 800 comprises a receiver 802, which receives a signal, for example, from a receive antenna (not shown) and performs typical actions (e.g., filters, amplifies, downconverts, etc.) with the received signal and digitizes required signal parameters to receive samples. Receiver 802 may be, for example, an MMSE receiver and may include a demodulator 804 that can demodulate received symbols and provide them to a processor 806 for channel estimation. The processor 806 may be a processor for analyzing information received by the receiver 802 and / or generating information for transmission by the transmitter 816, a processor that controls one or more components of the access terminal 800, and / or a processor that analyzes the information received by the receiver 802, generates information for transmission by transmitter 816 and controls one or more components of access terminal 800.

Access terminal 800 may further comprise a storage device 808 that is operatively coupled to a processor 806 and which can store data to be transmitted, received data, and any other suitable information associated with performing various actions and functions set forth herein. Storage device 808 can optionally store protocols and / or algorithms associated with rate matching based on a ring buffer.

It will be appreciated that the data store (e.g., storage device 808) described herein may be a volatile storage device or non-volatile storage device, or may include both volatile and non-volatile storage device. By way of illustration, but not limitation, non-volatile memory may 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 an external cache. By way of illustration, but not limitation, RAM is available in many forms, such as synchronous RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), Synchlink DRAM (SLDRAM) and direct Rambus RAM (DRRAM). A storage device 808 of the present systems and methods may include these and any other suitable types of storage devices.

The receiver 802, which may be substantially similar to the receiver 306 of FIG. 3, is further operatively coupled to the spreading encoder 810 and / or the structural multiplexer 812, which may be substantially similar to the spreading encoder 314 of FIG. 3 and the structural multiplexer 312, respectively, in FIG. 3. In addition, although not shown, it is contemplated that the access terminal 800 may include an SRS detector substantially similar to the SRS detector 310 of FIG. 3. Accordingly, the access terminal 800 can detect the SRS symbol in a time interval (for example, by using an SRS detector), use a structural multiplexer 812 to modify the channel structure for at least one time interval in a subframe, and access a spreading encoder 810 to determine the length and type of an orthogonal time domain spreading code to apply to the time segments of a subframe as a function of the presence of SRS, and further apply certain ith a spreading code to a channel of at least one time interval in a subframe.

FIG. 9 illustrates a system 900 that facilitates multiplexing SRSs in a wireless environment. System 900 comprises a base station 902 (e.g., an access point, etc.) with a receiver 910 that receives signal (s) from one or more access terminals 904 through multiple receive antennas 906, and a transmitter 922 that transmits to one or more access terminals 904 through a transmit antenna 908. A receiver 910 may receive information from receive antennas 906 and be further operably coupled to a demodulator 912 that demodulates received information. The demodulated symbols are analyzed by a processor 914, which may be similar to the processor described above with respect to FIG. 8, and which is connected to a memory 916 that stores data to be transmitted or received from access terminal (s) 904 (or another base station) (not shown)) and / or any other suitable information related to the various activities and functions set forth in this document.

The processor 914 is further associated with a spreading encoder 918, which can determine the length and type of an orthogonal spreading code in the time domain to apply to the time segments of a subframe as a function of the presence and / or absence of SRS.

The spreading encoder 918 may be operatively coupled to a structural multiplexer 920, which may modify the channel structure for at least one time interval in a subframe. Furthermore, although not shown, it is contemplated that base station 902 may include an SRS detector substantially similar to the SRS detector 310 of FIG. 3. The spreading encoder 918 and the structural multiplexer 920 may provide data to be transmitted to a modulator 922. For example, data to be transmitted that is included in a PUCCH channel (eg, an ACK or CQI channel) that is multiplexed with SRS. A modulator 922 may multiplex the frame for transmission by a transmitter 926 through an antenna 908 to an access terminal (s) 904. Although illustrated as being separate from processor 914, it should be appreciated that interleaver 918, interleaver 920, and / or modulator 922 may be part of processor 914 or a number of processors (not shown).

10 illustrates an example wireless communication system 1000. The wireless communication system 1000 shows one base station 1010 and one access terminal 1050 for short. However, it should be appreciated that system 1000 may include more than one base station and / or more than one access terminal, while additional base stations and / or access terminals may be very similar or different from the approximate base station 1010 and access terminal 1050, described below. In addition, it should be appreciated that the base station 1010 and / or access terminal 1050 may use the systems (Figs. 1, 3, 8-9 and 11) and / or methods (Figs. 6 and 7) described herein to simplify wireless communication between each other.

At base station 1010, traffic data for a number of data streams is provided from a data source 1012 to a transmit (TX) data processor 1014. According to an example, each data stream may be transmitted over a respective antenna. TX data processor 1014 formats, codes, and interleaves the traffic data stream based on the particular coding scheme selected for that data stream to provide encoded data.

The coded data for each data stream can be multiplexed with pilot data using orthogonal frequency division multiplexing (OFDM) technologies. 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 in access terminal 1050 in order to evaluate channel response. Multiplexed pilot signals and encoded data for each data stream can be modulated (e.g., mapped to symbols) based on a specific modulation scheme (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-phase shift keying (M- PSK), M-quadrature amplitude modulation (M-QAM), etc.) selected for this data stream to provide modulation symbols. The data rate, coding, and modulation for each data stream may be determined by instructions executed or provided by processor 1030.

Modulation symbols for all data streams may be provided to the TX MIMO processor 1020, which may further process modulation symbols (eg, for OFDM). The TX MIMO processor 1020 further provides N _T modulation symbol streams to N _T transmitters (TMTR) 1022a-1022t. In various embodiments, TX MIMO processor 1020 applies beamforming weights to the symbols of the data streams and to the antenna from which the symbol is transmitted.

Each transmitter 1022 receives and processes a respective symbol stream to provide one or more analog signals, and further leads to desired parameters (e.g., amplifies, filters, and upconverts) the analog signals to provide a modulated signal suitable for transmission over MIMO channel. Additionally, N _T modulated signals from transmitters 1022a through 1022t are transmitted from N _T antennas 1024a through 1024t, respectively.

At access terminal 1050, the transmitted modulated signals are received by N _R antennas 1052a-1052r, and the received signal from each antenna 1052 is provided to a respective receiver (RCVR) 1054a-1054r. Each receiver 1054 results in the required parameters (for example, filters, amplifies, and downconverts) the corresponding received signal, digitizes the reduced signal to the required parameters to provide samples, and further processes the samples to provide the corresponding “received” symbol stream.

An RX data processor 1060 may receive and process N _R received symbol streams from N _R receivers 1054 based on a particular receiver processing technique to provide N _T “detected” symbol streams. An RX data processor 1060 may demodulate, interleave, and decode each detected symbol stream to recover traffic data for the data stream. The processing by the RX data processor 1060 is complementary to the processing performed by the TX MIMO processor 1020 and TX data processor 1014 in the base station 1010.

The processor 1070 may periodically determine which available technology to use, as explained above. Additionally, processor 1070 may 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 related to the communication link and / or the received data stream. The reverse link message can then be processed by the TX data processor 1038, which also receives traffic data for a number of data streams from the data source 1036, modulated by modulator 1080, reduced to the desired parameters by transmitting devices 1054a-1054r, and transmitted back to base station 1010 .

At base station 1010, modulated signals from access terminal 1050 are received via antennas 1024, adjusted to desired parameters by receivers 1022, demodulated by demodulator 1040, and processed by RX data processor 1042 to extract a reverse link message transmitted by access terminal 1050. Additionally, processor 1030 may process the extracted message to determine which precoding matrix to use for determining beamforming weights.

Processors 1030 and 1070 may direct (e.g., control, coordinate, manage, etc.) operation at base station 1010 and access terminal 1050, respectively. Corresponding processors 1030 and 1070 may be associated with a storage device 1032 and 1072 that stores program codes and data. Processors 1030 and 1070 can also perform calculations to obtain frequency and impulse response estimates for the uplink and downlink, respectively.

In one aspect of the invention, logical channels are classified into control channels and traffic channels. The logical control channels may include a broadcast control channel (BCCH), which is a DL channel for broadcasting system control information. Additionally, the logical control channels may include a paging control channel (PCCH), is a DL channel that transmits paging information. In addition, the logical control channels may include a multicast control channel (MCCH), which is a point-to-multipoint type DL channel used to transmit the schedule and control information of a multimedia broadcast / multicast service (MBMS) for one or more MTCHs . As a rule, after establishing an RRC connection (radio resource controller), this channel is used only by UEs that receive MBMS (for example, old MCCH + MSCH). Additionally, the logical control channels may include a dedicated control channel (DCCH), is a bi-directional channel such as a point-to-point channel that transmits specialized control information and is used by UEs having an RRC connection. In one aspect, the logical traffic channels may comprise a dedicated traffic channel (DTCH), which is a bi-directional point-to-point channel type channel allocated to one UE for transmitting user information. In addition, the logical traffic channels may include a multicast traffic channel (MTCH), which is a point-to-multipoint DL channel for transmitting traffic data.

In an aspect of the invention, transport channels are classified into DL and UL. DL transport channels comprise a broadcast channel (BCH), a downlink shared channel (DL-SDCH), and a paging channel (PCH). The PCH may support the power saving mode of the UE (discontinuous reception (DRX) cycle is indicated by the network for the UE), broadcast throughout the cell and converted to PHY resources (physical layer) that can be used for other control / traffic channels. UL transport channels may comprise a random access channel (RACH), a request transmission channel (REQCH), an uplink shared data channel (UL-SDCH), and a plurality of PHY channels.

PHY channels contain a set of DL channels and UL channels. For example, DL PHY channels may include: a common pilot channel (CPICH); synchronization channel (SCH); common control channel (CCCH); DL Shared Control Channel (SDCCH); multicast control channel (MCCH); UL Shared Destination Channel (SUACH); acknowledgment channel (ACKCH), DL physical shared data channel (DL-PSDCH); UL Power Control Channel (UPCCH); paging indicator channel (PICH); and / or a load indicator channel (LICH). As an additional illustration of UL, PHY channels may include: a physical random access channel (PRACH); Channel Quality Indicator Channel (CQICH); acknowledgment channel (ACKCH); antenna subset indicator channel (ASICH); Shared Request Channel (SREQCH); UL Physical Shared Data Channel (UL-PSDCH) and / or Broadband Pilot Channel (BPICH).

It should be understood that the embodiments described herein may be implemented by hardware, software, firmware, middleware, microcode, or any combination of the above. When implemented in hardware, the processing units can be implemented in one or more specialized integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), user programmable matrix LSIs (FPGAs) , processors, controllers, microcontrollers, microprocessors, other electronic devices designed to perform the functions described in this document, or combinations thereof.

When embodiments are implemented in software, firmware, middleware, or microcode, the program code or code segments can be stored on a computer-readable medium, such as a storage component. A code segment can represent a procedure, function, subprogram, program, standard procedure, nested procedure, module, software package, class, or any combination of instructions, data structures, or program statements. A code segment may be associated with another code segment or a hardware circuit by transmitting and / or receiving information, data, arguments, parameters, or memory contents. Information, arguments, parameters, data, etc. can be transmitted, forwarded or forwarded by any appropriate means, including memory sharing, messaging, hand-off, data transmission over the network, etc.

When implemented in software, the techniques described in this document can be implemented using modules (for example, procedures, functions, etc.) that perform the functions described in this document. Program codes can be stored in memory and executed by processors. The storage device can be implemented in the processor or externally with respect to the processor, and in the second case, it can be functionally connected to the processor using various means known in the art.

11, illustrated is a system 1100 that enables the multiplexing of an SRS channel in a wireless environment. For example, system 1100 may reside at least partially within a base station. According to another illustration, system 1100 may reside, at least in part, in an access terminal. It should be appreciated that the system 1100 is presented as including functional blocks, which may be functional blocks that represent functions implemented by a processor, software, or a combination of the above (e.g., firmware). System 1100 includes a logical grouping 1102 of electrical components that can act in conjunction.

For example, logical grouping 1102 may include an electrical component for detecting an SRS symbol in a time interval of a subframe included in resource block 1104. Additionally, logical grouping 1102 may include an electrical component for calculating the length and type of time domain spreading code to apply to time segments of a subframe, based on the presence of SRS 1106. In addition, logical grouping 1102 may include an electrical component to modify the channel structure of one or more its time intervals in subframe 1108. Logical grouping 1102 may also include an electrical component for implementing the calculated spreading code for one or more channels in a time interval and / or resource block 1110. For example, an SRS detected in a time interval of a resource block may be multiplexed with other data channels in the PUCCH areas, such as, for example, a CQI or ACK channel. Accordingly, the SRS can be recognized or detected in the time interval of the resource block. The channel structure for this time interval can then be modified, for example, by decreasing the number of symbols in the time interval with SRS. Thus, the number of ACK, CQI, or RS characters may be reduced to provide a position for SRS. The remaining 5 (for long CP) or 6 (for short CP) characters can be structured with time-domain spreading codes, the type and length of which can be determined as a function of the presence or absence of SRS in the time interval. Additionally, system 1100 may include a memory 1110 that stores instructions for performing functions associated with electrical components 1104, 1106, 1108, and 1110. Although they are shown as being external to memory 1112, it should be understood that one or more of electrical components 1104, 1106, 1108, and 1110 may exist within the storage device 1112.

What is described above includes examples of one or more embodiments. Of course, it is impossible to describe every possible combination of components or technologies in order to describe the above embodiments, but those skilled in the art may recognize that many additional combinations and permutations of various embodiments are permissible. Therefore, the described embodiments are intended to cover all such transformations, modifications, and variations that fall within the spirit and scope of the appended claims. Moreover, to the extent that the term “includes” is used either in the detailed description or in the claims, this term is intended to be inclusive in a manner similar to the term “comprising”, as “comprising” is interpreted when used as a transition words in the claims.

Claims (48)

1. A method for multiplexing a sounding resource signal (SRS) in a wireless communication environment, comprising the steps of:
detecting the presence of an SRS symbol in a subframe time interval;
modifying the channel structure for at least one subframe time interval;
determining the length and type of the orthogonal spreading code in the time domain to apply to the channel in the time slots of the subframe as a function of the presence of the SRS; and
apply a specific spreading code to the channel in at least one time interval in a subframe. 2. The method according to claim 1, in which the modification of the channel structure for at least one time interval of a subframe further comprises the step of reducing the number of acknowledgment symbols (ACK) in a time interval including SRS. 3. The method according to claim 2, in which the application of a specific spreading code to the channel in at least one time interval in a subframe further comprises the step of applying a 3-point spreading code according to the discrete Fourier transform (DFT) method to a time interval including SRS for ACK symbols and reference signal (RS) symbols. 4. The method according to claim 2, in which the application of a specific spreading code to a channel in at least one time interval in a subframe further comprises the step of applying a 4-point orthogonal spreading code for ACK symbols in the second time interval and applying a 3-point DFT spreading code for RS symbols, wherein the orthogonal spreading code is Hadamard or DFT. 5. The method according to claim 1, in which determining the length and type of the orthogonal spreading code in the time domain to apply to the channel at subframe time intervals as a function of the presence of the SRS further comprises the step of using a long cyclic prefix (CP) for the subframe . 6. The method according to claim 5, in which the application of a specific spreading code to the channel in at least one time interval in the subframe further comprises the step of applying, in the time interval including SRS, a 3-point spreading code according to the DFT method for ASK symbols and apply a 2-point orthogonal spreading code for RS symbols. 7. The method according to claim 5, in which the application of a specific spreading code to a channel in at least one time interval in a subframe further comprises the step of applying a 4-point orthogonal spreading code for ACK symbols in a second time interval and applying a 2-point orthogonal spreading code for RS symbols. 8. The method according to claim 1, in which the modification of the channel structure for at least one time interval of a subframe further comprises the step of reducing the number of RS symbols in a time interval including SRS. 9. The method of claim 8, in which the application of a specific spreading code to the channel in at least one time interval in a subframe further comprises the step of applying a 2-point or 4- time interval in the time interval including SRS DFT spread point code for ASK symbols, and a 2-point DFT spread code for RS symbols. 10. The method of claim 8, wherein applying a specific spreading code to a channel in at least one time interval in a subframe further comprises applying a 4-point orthogonal spreading code for ACK symbols in a second time interval and applying a 3-point DFT spreading code for RS symbols. 11. The method according to claim 1, in which the modification of the channel structure for at least one time interval of a subframe further comprises reducing the number of channel quality indicator (CQI) symbols in a time interval including SRS. 12. The method according to claim 11, further comprising the step of increasing the effective code rate by reducing the number of RS symbols for the CQI channel. 13. A wireless communications device, comprising:
a storage device that stores instructions related to detecting the presence of an SRS symbol in a time interval of a subframe, modifying the channel structure for one or more time intervals in the subframe, calculating the type and length of the orthogonal spreading code in the time domain to apply the channel in the time intervals of the subframe , based on the presence of SRS in the time interval, by implementing the calculated spreading code in one or more time intervals of a subframe in the channel; and
a processor coupled to the storage device, configured to implement instructions stored in the storage device. 14. The wireless communications apparatus of claim 13, wherein the storage device further stores instructions associated with reducing the number of ACK symbols in a time interval including SRS. 15. The wireless communications apparatus of claim 14, wherein the storage device further stores instructions related to implementing a 3-point DFT spreading code in a time interval including SRS for ACK symbols and RS symbols. 16. The wireless communications apparatus of claim 14, wherein the storage device further stores instructions related to the implementation of the 4-point orthogonal spreading code for ACK symbols in the second time interval and the implementation of the 3-point spreading code according to the DFT method for RS- characters. 17. The wireless communications apparatus of claim 13, wherein the storage device further stores instructions associated with using a long CP for a subframe. 18. The wireless communications apparatus of claim 17, wherein the storage device further stores instructions related to implementing, in an interval of time including SRS, a 3-point DFT spreading code for ACK symbols and implementing a 2-point orthogonal code Spectrum extensions for RS characters. 19. The wireless communications apparatus of claim 17, wherein the storage device further stores instructions related to the implementation of the 4-point orthogonal spreading code for the ASK symbols in the second time interval and the implementation of the 2-point orthogonal spreading code for the RS symbols. 20. The wireless communications apparatus of claim 13, wherein the storage device further stores instructions related to reducing the number of RS symbols in a time interval including SRS. 21. The wireless communications apparatus of claim 20, wherein the storage device further stores instructions associated with the implementation of a time interval including SRS, a 2-point or 4-point spreading code according to the DFT method for ASK symbols and implementation 2 -point code spread spectrum according to the DFT method for RS-characters. 22. The wireless communication device according to claim 20, in which the storage device further stores instructions related to the implementation in the second time interval of a 4-point orthogonal spreading code for ASK symbols and the implementation of a 3-point spreading code according to the DFT method for RS- characters. 23. The wireless communications apparatus of claim 13, wherein the storage device further stores instructions related to reducing the number of CQI symbols in a time interval including SRS. 24. The wireless communications apparatus of claim 23, wherein the storage device further stores instructions related to increasing an effective code rate by reducing the number of RS symbols for a CQI channel. 25. An apparatus for multiplexing SRS in a wireless communication system, comprising:
means for detecting an SRS symbol in a time interval of a subframe;
means for adjusting the channel structure for at least one time interval in a subframe;
means for using the presence of the SRS to determine the type and length of the orthogonal time-domain spreading code to apply to the channel in one or more time slots of a subframe; and
means for applying a specific spreading code to the channel for at least one time interval in a subframe. 26. The device according A.25, further comprising means for reducing the number of ASK symbols in a time interval including SRS. 27. The device according A.25, further comprising means for reducing the number of RS-symbols in the time interval, including SRS. 28. The device according A.25, further comprising means for reducing the number of CQI symbols by one in a time interval including SRS. 29. The device according to p. 28, additionally containing means for increasing the effective code rate for the CQI channel. 30. A machine-readable medium on which computer instructions are stored that, when executed by a computer, cause the computer to:
detect an SRS symbol in a subframe time interval;
change the channel structure for a time interval in a subframe;
determine the type and length of the orthogonal spreading code in the time domain in order to apply to the channel for one or more time slots a subframe as a function of the presence of SRS in one or more time slots; and
use a specific spreading code for the channel in at least one time interval in a subframe. 31. The computer-readable medium of claim 30, further comprising instructions that, when executed by a computer, cause the computer to reduce the number of ACK symbols in a time interval including SRS. 32. The computer-readable medium of claim 31, further comprising instructions that, when executed by a computer, cause the computer to use a 3-point DFT spreading code in a time interval including SRS for ASK symbols and RS symbols. 33. The computer-readable medium of claim 31, further comprising instructions that, when executed by a computer, cause the computer to use a 4-point orthogonal spreading code for ASK symbols in the second time interval and use a 3-point DFT spreading code for RS symbols . 34. The computer-readable medium of claim 30, further comprising instructions that, when executed by a computer, cause the computer to use a long SR for a subframe. 35. The computer-readable medium of claim 34, further comprising instructions that, when executed by a computer, cause the computer to use a 3-point DFT spreading code for ACK symbols in an interval including SRS and use a 2-point orthogonal spreading code spectrum for RS characters. 36. The computer-readable medium of claim 34, further comprising instructions that, when executed by a computer, cause the computer to use a 4-point orthogonal spreading code for ASK symbols in the second time interval and use a 2-point orthogonal spreading code for RS symbols. 37. The computer-readable medium of claim 30, further comprising instructions that, when executed by a computer, cause the computer to reduce the number of RS characters in a time interval including SRS. 38. The computer-readable medium of claim 37, further comprising instructions that, when executed by a computer, cause the computer to use a 2-point or 4-point DFT spreading code for ASK symbols in a time interval including SRS and use 2- DFT dot spreading code for RS characters. 39. The computer-readable medium of claim 37, further comprising instructions that, when executed by a computer, cause the computer to use a 4-point orthogonal spreading code for ASK symbols in the second time interval and use a 3-point DFT spreading code for RS symbols . 40. The computer-readable medium of claim 30, further comprising instructions that, when executed by a computer, cause the computer to reduce the number of CQI characters in a time interval including SRS. 41. The computer-readable medium of claim 40, further comprising instructions that, when executed by a computer, cause the computer to increase the effective code rate by reducing the number of RS symbols for the CQI channel. 42. A device for detecting an SRS symbol in a wireless communication system, comprising:
a processor configured to:
detect an SRS symbol in a subframe time interval;
modify the channel structure of at least one time interval in a subframe;
calculate the type and length of the orthogonal spreading code in the time domain to apply to one or more time slots of a subframe for the channel, the spreading code being calculated as a function of the presence of SRS in one or more time slots of the subframe; and
apply the spreading code to the channel for at least one time interval in a subframe. 43. A method for multiplexing SRS in an ACK channel in a wireless communication environment, comprising the steps of:
detecting the presence of an SRS symbol in a subframe time interval;
modifying the structure of the ASK channel for at least one subframe time interval;
determining the length and type of the orthogonal spreading code in the time domain in order to apply to the ASK channel at subframe time intervals, as a function of the presence of SRS; and
apply a specific spreading code to the ASK channel in at least one time interval in a subframe. 44. The method according to item 43, in which the step of modifying the structure of the ASK channel for at least one time interval of the subframe further comprises reducing the number of at least one of the ASK symbols or RS symbols in the interval the time of the ACK channel including the SRS. 45. A wireless communications device, comprising:
a storage device that stores instructions related to detecting the presence of an SRS symbol in a time interval of a subframe, modifying the structure of the ASK channel for one or more time intervals in the subframe, calculating the type and length of the orthogonal spreading code in the time domain to apply the ASK channel in subframe time intervals, based on the presence of the SRS in the time interval, by implementing the calculated spreading code in one or more subframe time intervals in the ACK channel; and
a processor coupled to the storage device, configured to implement instructions stored in the storage device. 46. A device for multiplexing SRS in an ASK channel in a wireless communication system, comprising:
means for detecting an SRS symbol in a time interval of a subframe;
means for adjusting the structure of the ASK channel for at least one time interval in a subframe;
means for using the presence of the SRS to determine the type and length of the orthogonal time-domain spreading code to apply to the ASK channel in one or more time slots of a subframe; and
means for applying a specific spreading code to the ASK channel for at least one time interval in a subframe. 47. A machine-readable medium on which computer instructions are stored that, when executed by a computer, cause the computer to:
detect an SRS symbol in a subframe time interval;
change the structure of the ASK channel for a time interval in a subframe;
determine the type and length of the orthogonal spreading code in the time domain in order to apply to the ASK channel for one or more time slots of a subframe as a function of the presence of SRS in one or more time slots; and
use a specific spreading code for the ASK channel in at least one time interval in a subframe. 48. A device for detecting an SRS symbol in a wireless communication system, comprising:
a processor configured to:
detect an SRS symbol in a subframe time interval;
modify the structure of the ASK channel of at least one time interval in a subframe;
calculate the type and length of the orthogonal spreading code in the time domain to apply to one or more time slots of the subframe for the ASK channel, the spreading code being calculated as a function of the presence of the SRS in one or more time slots of the subframe; and
apply the spreading code to the ASK channel for at least one time interval in a subframe.

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