Source: https://patents.google.com/patent/US9515713B2/en
Timestamp: 2018-09-19 21:54:12
Document Index: 246017681

Matched Legal Cases: ['Application No. 200980124006', 'Application No. 10', 'Application No. 2014', 'Application No. 2014', 'Application No. 2011', 'Application No. 10', 'Application No. 2014', 'Application No. 2014', 'Application No. 2011', 'Application No. 2015', 'Application No. 10', 'Application No. 09771013', 'Application No. 14188394']

US9515713B2 - Including feedback information regarding an individual subband of a wireless channel - Google Patents
Including feedback information regarding an individual subband of a wireless channel Download PDF
US9515713B2
US9515713B2 US14481278 US201414481278A US9515713B2 US 9515713 B2 US9515713 B2 US 9515713B2 US 14481278 US14481278 US 14481278 US 201414481278 A US201414481278 A US 201414481278A US 9515713 B2 US9515713 B2 US 9515713B2
US14481278
US20140376500A1 (en )
Gaurav Hemrajani
This application is a continuation of U.S. patent application Ser. No. 12/993,330, entitled “Including Feedback Information Regarding an Individual Subband of a Wireless Channel,” filed Nov. 18, 2010, which is a National Phase Application under 35 USC 371 of PCT/US09/48629, filed Jun. 25, 2009, which claims the benefit of U.S. Provisional Patent Application Ser. No. 61/075,667, filed Jun. 25, 2008 and U.S. Provisional Patent Application Ser. No. 61/077,276, filed Jul. 1, 2008, which are herein incorporated by reference in their entirety as though fully and completely set forth herein.
In accordance with some preferred embodiments, a technique or mechanism for reporting feedback information regarding a wireless channel is provided, in which feedback information regarding individual subbands can be provided to a base station. As used here, the term “wireless channel” refers to a collection of resources that can be used by wireless nodes, including mobile stations and base stations, to communicate wirelessly with each other. The resources include subcarriers of different frequencies. In addition, resources can include different time slots or different precoding vectors. In one embodiment, a wireless channel can be implemented according to an orthogonal frequency division multiplexing (OFDM) arrangement in which resources of the wireless channel are defined by combinations of time slots (along a time dimension) and subcarriers of different frequencies (along a frequency dimension).
In the OFDM arrangement, a subband (also referred to as “band”) can include a number of subcarriers along the frequency dimension and all the OFDM symbols (time slots) along the time dimension. A wireless channel can thus be divided into multiple subbands. More generally, a “subband” refers to some predefined portion of a wireless channel, which can have multiple such predefined portions to use for communicating data between mobile stations and base stations.
Another example of feedback information that can be sent from a mobile station to a base station includes a channel quality indicator (CQI), which is an indication of wireless channel quality.
In accordance with some embodiments, the type of feedback information that is reported from the mobile station back to the base station depends on whether a predefined condition is satisfied. In some implementations, this predefined condition is an indication of whether or not the mobile station is a slow moving (or stationary) mobile station or a fast moving (high velocity) mobile station. For a slow moving mobile station, it is likely that parameters of the feedback information do not change over several reporting periods, such that reporting the same parameters in corresponding reporting periods is redundant. For a slow moving mobile station, instead of repeatedly sending the same parameters in successive reporting periods, different feedback information can be sent in the different reporting periods. In other words, the reporting periodicity of different types of feedback information for different users can be set to different values.
However, in accordance with some preferred embodiments, when the predefined condition is detected, instead of sending aggregate feedback information, individual feedback information for individual subbands can be reported (referred to as “incremental feedback reporting”). Thus, for example, instead of reporting an aggregate CQI for multiple subbands, an individual CQI for an individual subband can be reported. Similarly, instead of reporting an aggregate PMI that is based on aggregate properties of multiple subbands, an individual PMI can be reported for an individual subband.
From among a collection of subbands of a wireless channel, a subset of the subbands can be identified as being the preferred or “best” subbands of the wireless channel. For example, M (M>1) subbands can be identified. These M subbands can be used for communicating traffic data or higher-layer signaling information between a base station and a mobile station.
A cell sector is one section of a cell of a cellular network. Although just two paths 104 and 106 are depicted in FIG. 1, it is noted that more than two paths (or just one path) can be provided in a cell sector in other embodiments. In alternative implementations, rather than providing multiple beams in a cell sector, it is noted that multiple beams can be provided in a cell. As used here, the term “cell segment” can refer to either a cell sector or a cell.
Although just one base station is depicted in FIG. 1, it is noted that a wireless network would typically include multiple base stations. In some embodiments, the wireless network is an LTE wireless network. In alternative embodiments, other types of wireless networks can be employed. Note that reference to “LTE wireless network” refers to a wireless network that conforms to the requirements of the LTE standard developed by 3GPP, as that standard is modified or evolved over time, as well as to subsequent standards that evolve from LTE. Moreover, even though reference is made to LTE wireless networks in the ensuing discussion, it is noted that techniques according to preferred embodiments can also be applied to non-LTE, OFDM-based wireless networks.
In an LTE wireless network, the base station 100 includes an enhanced node B (“eNode B”), which includes a base transceiver station that includes the antenna array 102. The base station 100 may also includes a radio network controller that cooperates with the enhanced node B. The radio network controller and/or enhanced node B can perform one or more of the following tasks: radio resource management, mobility management for managing mobility of mobile stations, routing of traffic, and so forth. Note that one radio network controller can access multiple eNode Bs, or alternatively, an eNode B can be accessed by more than one radio access controller.
As noted above, in accordance with some embodiments, incremental reporting of feedback information including CQI and PMI can be performed. In one implementation, the reporting of such feedback information can be in the physical uplink shared channel (PUSCH). However, in other implementations, feedback information can be provided in other types of channels or messages sent from the mobile station to the base station, e.g., the physical uplink control channel (PUCCH). Generally, feedback information is referred to as being sent in a report, where a “report” can include a message, fields of a message, multiple messages, and so forth.
According to some implementations, two modes of operation as defined by the LTE standards can employ the incremental feedback reporting according to preferred embodiments. These two modes of operation include LTE PUSCH reporting Mode 2-0 and Mode 2-2. PUSCH reporting Mode 2-0 as defined by LTE is used for single input, multiple output (SIMO) communication, spatial frequency block coding (SFBC) communication, or open-loop spatial multiplexing (SM) communication. In this reporting mode, the precoding information is not included in the feedback.
In the example of FIG. 2, it is assumed that in each of the reporting intervals 2-4, the bitmap remains the same as the bitmap reported in time interval 1. In reporting interval 2, the subband CQI information field 204 includes the individual CQI for a first individual subband from among the M subbands. Similarly, in reporting intervals 3 and 4, the subband CQI information fields 204 of the respective reports contain individual CQIs for corresponding second and third subbands from the M subbands. Thus, when the bitmap does not change, individual CQIs can be reported rather than the aggregate CQI.
FIG. 3 shows reports sent in four different reporting intervals (1, 2, 3, 4) for on enhanced LTE PUSCH reporting Mode 2-2. Mode 2-2, in addition to CQI information, PMI information is also provided (since closed loop MIMO is used). Moreover, in Mode 2-2, it is assumed that there are two transmitting codewords such that CQI information for the two transmitting codewords are reported separately. In each report shown in FIG. 3, a bitmap field 302 contains the bitmap, a first subband CQI field 304 contains the subband CQI information for a first transmitting codeword, a wideband CQI field 306 contains the wideband CQI, a second subband CQI information field 308 contains the subband CQI information for a second transmitting codeword, and a PMI information field 310 contains PMI information. In the reporting interval 1 of FIG. 3, it is assumed that the current bitmap is different from the prior bitmap (in the prior reporting interval). As a result, the subband CQIs provided in the subband CQI information fields 304 and 308, as well as the PMI information in the PMI information field 310, are aggregate CQIs and PMI, respectively, for the M subbands identified by the bitmap in the field 302.
FIGS. 4 and 5 depict operations of a mobile station and base station, respectively, for an enhanced PUSCH reporting Mode 2-0 operation. In a current reporting interval, the mobile station determines (at 402) if the present bitmap is the same as the prior bitmap. If not, the CQI information reported (at 404) in the subband CQI information field 204 (FIG. 2) is the aggregate CQI over the M subbands. However, if the current bitmap is the same as the prior bitmap, then the CQI information reported (at 406) in the subband CQI information field 204 is the individual CQI for corresponding individual subband.
The tasks of FIGS. 4-8 can be performed by software in the mobile station 110 or base station 100 of FIG. 1. Instructions of such software are executed on a processor (e.g., CPUs 130 and 122 in FIG. 1). The processor includes microprocessors, microcontrollers, processor modules or subsystems (including one or more microprocessors or microcontrollers), or other control or computing devices. A “processor” can refer to a single component or to plural components (e.g., one or multiple CPUs).
1. A method of reporting feedback information regarding a wireless channel comprising:
determining whether a parameter of aggregate feedback information regarding plural subbands included in a prior report sent to a base station has not changed;
in response to determining that the parameter has not changed, including, in a first report to be sent to a base station, feedback information regarding an individual one of plural subbands of the wireless channel; and
in response to determining that the parameter has changed, including, in a second report to be sent to the base station, aggregate feedback information regarding the plural subbands.
2. The method of claim 1, wherein the parameter of aggregate feedback information is a data structure identifying preferred subbands.
3. The method of claim 2, wherein determining if the data structure identifying preferred subbands has not changed comprises determining if a bitmap identifying the preferred subbands has not changed.
after sending the first report, including, in a third report to be sent to the base station, further feedback information regarding a second individual one of the plural subbands if the parameter has not changed.
including in the first report further feedback information regarding a second individual one of the plural subbands.
performing data communication using one or more of the plural subbands that are less than all available subbands of the wireless channel.
7. The method of claim 1, wherein the feedback information is for a closed loop MIMO (multiple input, multiple output) mode of operation.
8. The method of claim 7, wherein the mobile station is to transmit plural codewords, and wherein the feedback information included in the first report is for a first of the plural codewords, and wherein the first report further includes feedback information for an individual subband for another one of the plural codewords.
9. The method of claim 1, wherein the feedback information in the first report for the individual subband comprises at least one of:
a precoding matrix index (PMI); and
an interface to communicate wirelessly over a wireless channel with a mobile station; and
determine whether a parameter of aggregate feedback information regarding plural subbands for a current reporting interval has not changed from a parameter of aggregate feedback information regarding plural subbands for a prior reporting interval;
in response to determining that the parameter has not changed, using individual feedback information for an individual subband of plural subbands of the wireless channel; and
in response to determining that the parameter has changed, using aggregate feedback information for the plural subbands.
11. The base station of claim 10, wherein the individual feedback information or aggregate feedback information is used for downlink signaling and traffic data to be sent to the mobile station.
12. The base station of claim 10, wherein the individual feedback information comprises at least one of:
an individual channel quality indicator (CQI); and
an individual precoding matrix index (PMI).
13. The base station of claim 10, wherein to determine whether the parameter has not changed the processor is further configured to:
determine if a bitmap for a current reporting interval is unchanged from a bitmap for a prior reporting interval, wherein the bitmap identifies the plural subbands.
an interface to communicate wirelessly over a wireless channel with a base station; and
determine whether a parameter of aggregate feedback information regarding plural subbands included in a prior report sent to a base station has not changed;
in response to determining that the parameter has not changed, include, in a first report to be sent to a base station, individual feedback information regarding an individual one of plural subbands of the wireless channel; and
15. The mobile station of claim 14, wherein the first report includes a bitmap identifying the plural subbands as being preferred subbands.
16. The mobile station of claim 14, wherein the individual feedback information includes at least one of:
17. The mobile station of claim 14, wherein to determine whether the parameter has not changed the processor is further configured to:
determine whether a bitmap identifying the plural subbands remains the same in successive reporting intervals.
18. The mobile station of claim 14, wherein the feedback information is for a closed loop MIMO (multiple input, multiple output) mode of operation.
19. The mobile station of claim 18, wherein the mobile station is to transmit plural codewords, and wherein the feedback information included in the first report is for a first of the plural codewords, and wherein the first report further includes feedback information for an individual subband for another one of the plural codewords.
20. The mobile station of claim 14, wherein the processor is further configured to:
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