U.S. patent application number 14/469349 was filed with the patent office on 2019-01-17 for backward compatible bandwidth extension.
The applicant listed for this patent is TEXAS INSTRUMENTS INCORPORATED. Invention is credited to Runhua CHEN, Anand G. DABAK, Tarik MUHAREMOVIC, Eko N. ONGGOSANUSI, Badri VARADARAJAN.
Application Number | 20190020452 14/469349 |
Document ID | / |
Family ID | 41215009 |
Filed Date | 2019-01-17 |
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United States Patent
Application |
20190020452 |
Kind Code |
A9 |
ONGGOSANUSI; Eko N. ; et
al. |
January 17, 2019 |
BACKWARD COMPATIBLE BANDWIDTH EXTENSION
Abstract
A transmitter includes a bandwidth configuration unit configured
to provide an increased system bandwidth corresponding to a
bandwidth extension over multiple component carriers Additionally,
the transmitter also includes a transmit unit configured to employ
the bandwidth extension.
Inventors: |
ONGGOSANUSI; Eko N.; (Allen,
TX) ; DABAK; Anand G.; (Plano, TX) ;
VARADARAJAN; Badri; (Mountain View, CA) ; CHEN;
Runhua; (Plano, TX) ; MUHAREMOVIC; Tarik;
(Pearland, TX) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
TEXAS INSTRUMENTS INCORPORATED |
Dallas |
TX |
US |
|
|
Prior
Publication: |
|
Document Identifier |
Publication Date |
|
US 20140362818 A1 |
December 11, 2014 |
|
|
Family ID: |
41215009 |
Appl. No.: |
14/469349 |
Filed: |
August 26, 2014 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
12427124 |
Apr 21, 2009 |
8817818 |
|
|
14469349 |
|
|
|
|
61048698 |
Apr 29, 2008 |
|
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61047294 |
Apr 23, 2008 |
|
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04L 5/0044 20130101;
Y02D 70/1262 20180101; Y02D 70/1244 20180101; Y02D 70/444 20180101;
Y02D 70/23 20180101; Y02D 70/449 20180101; Y02D 70/26 20180101;
H04L 5/0048 20130101; H04L 5/003 20130101; H04B 7/0413 20130101;
Y02D 70/40 20180101; H04W 52/0229 20130101; H04B 1/1615 20130101;
H04B 7/2656 20130101; H04L 5/0007 20130101; Y02D 30/70
20200801 |
International
Class: |
H04L 5/00 20060101
H04L005/00 |
Claims
1. An apparatus comprising: a bandwidth configuration unit
configured to provide control information in an increased bandwidth
corresponding to a bandwidth extension over multiple component
carriers; and a transmit unit configured to employ the bandwidth
extension.
2. The apparatus as recited in claim 1 wherein the bandwidth
extension jointly aggregates multiple contiguous component carriers
into a single carrier of larger bandwidth.
3. The apparatus as recited in claim 1 wherein the bandwidth
extension constitutes multiple separate non-contiguous component
carriers.
4. The apparatus as recited in claim 1 wherein the bandwidth
extension includes common control information that occupies only
one component carrier or is replicated in all component
carriers.
5. The apparatus as recited in claim 1 wherein the bandwidth
extension includes dedicated control information that occupies at
least one component carrier.
6. (canceled)
7. A method of operating a transmitter, comprising: providing
control information in an increased bandwidth corresponding to a
bandwidth extension over multiple component carriers; and
transmitting from said transmitter in accordance to the bandwidth
extension.
8. The method as recited in claim 7 wherein the bandwidth extension
includes common control information that occupies only one
component carrier or is replicated in all component carriers.
9. The method as recited in claim 7 wherein the bandwidth extension
includes dedicated control information that occupies at least one
component carrier.
10. (canceled)
11. A receiver, comprising: a receive unit configured to receive a
transmission having control information in an increased bandwidth;
and a bandwidth adaptation unit configured to apply the increased
bandwidth corresponding to a bandwidth extension over multiple
component carriers.
12. The receiver as recited in claim 11 wherein the bandwidth
extension jointly aggregates multiple contiguous component carriers
into a single carrier of larger bandwidth.
13. The receiver as recited in claim 11 wherein the bandwidth
extension constitutes multiple separate contiguous or noncontiguous
component carriers.
14. The receiver as recited in claim 11 wherein the bandwidth
extension includes common control information that one component
carrier or is replicated in all component carriers.
15. The receiver as recited in claim 11 wherein the bandwidth
extension includes dedicated control information that occupies at
least-one component carrier.
16. (canceled)
17. A method of operating a receiver, comprising: receiving in said
receiver a transmission having control information in an increased
system bandwidth; and applying the increased system bandwidth
corresponding to a bandwidth extension over multiple component
carriers.
18. The method as recited in claim 17 wherein the bandwidth
extension includes common control information that occupies only
one component carrier or-is replicated in all component
carriers.
19. The method as recited in claim 17 wherein the bandwidth
extension includes dedicated control information that occupies at
least one component carrier.
20. (canceled)
21. The transmitter as recited in claim 1 wherein the bandwidth
extension constitutes multiple separate contiguous component
carriers.
22. The transmitter as recited in claim 1 wherein the control
information in the bandwidth extension includes common control
information that occupies only one component carrier.
23. The transmitter as recited in claim 1 wherein the control
information in the bandwidth extension includes dedicated control
information that occupies only one component carrier.
24. The transmitter as recited in claim 1 wherein the control
information in the bandwidth extension includes common control
information that occupies two component carriers.
25. The transmitter as recited in claim 1 wherein the control
information in the bandwidth extension includes dedicated control
information that occupies two component carriers.
26. The transmitter as recited in claim 1 wherein the control
information in the bandwidth extension includes common control
information that occupies more than two component carriers.
27. The transmitter as recited in claim 1 wherein the control
information in the bandwidth extension includes dedicated control
information that occupies more than two component carriers.
28. The transmitter as recited in claim 1 wherein each component
carrier has a 20 MHz bandwidth.
29. The method as recited in claim 7 wherein the bandwidth
extension constitutes multiple separate contiguous component
carriers.
30. The method as recited in claim 7 wherein the control
information in the bandwidth extension includes common control
information that occupies only one component carrier.
31. The method as recited in claim 7 wherein the control
information in the bandwidth extension includes dedicated control
information that occupies only one component carrier.
32. The method as recited in claim 7 wherein the control
information in the bandwidth extension includes common control
information that occupies two component carriers.
33. The method as recited in claim 7 wherein the control
information in the bandwidth extension includes dedicated control
information that occupies two component carriers.
34. The method as recited in claim 7 wherein the control
information in the bandwidth extension includes common control
information that occupies more than two component carriers.
35. The method as recited in claim 7 wherein the control
information in the bandwidth extension includes dedicated control
information that occupies more than two component carriers.
36. The method as recited in claim 7 wherein each component carrier
has a 20 MHz bandwidth.
37. The receiver as recited in claim 11 wherein the bandwidth
extension constitutes multiple separate contiguous component
carriers.
38. The receiver as recited in claim 11 wherein the control
information in the bandwidth extension includes common control
information that occupies only one component carrier.
39. The receiver as recited in claim 11 wherein the control
information in the bandwidth extension includes dedicated control
information that occupies only one component carrier.
40. The receiver as recited in claim 11 wherein the control
information in the bandwidth extension includes common control
information that occupies two component carriers.
41. The receiver as recited in claim 11 wherein the control
information in the bandwidth extension includes dedicated control
information that occupies two component carriers.
42. The receiver as recited in claim 11 wherein the control
information in the bandwidth extension includes common control
information that occupies more than two component carriers.
43. The receiver as recited in claim 11 wherein the control
information in the bandwidth extension includes dedicated control
information that occupies more than two component carriers.
44. The receiver as recited in claim 11 wherein each component
carrier has a 20 MHz bandwidth.
45. The method as recited in claim 17 wherein the bandwidth
extension constitutes multiple separate contiguous component
carriers.
46. The method as recited in claim 17 wherein the control
information in the bandwidth extension includes common control
information that occupies only one component carrier.
47. The method as recited in claim 17 wherein the control
information in the bandwidth extension includes dedicated control
information that occupies only one component carrier.
48. The method as recited in claim 17 wherein the control
information in the bandwidth extension includes common control
information that occupies two component carriers.
49. The method as recited in claim 17 wherein the control
information in the bandwidth extension includes dedicated control
information that occupies two component carriers.
50. The method as recited in claim 17 wherein the control
information in the bandwidth extension includes common control
information that occupies more than two component carriers.
51. The method as recited in claim 17 wherein the control
information in the bandwidth extension includes dedicated control
information that occupies more than two component carriers.
52. The method as recited in claim 17 wherein each component
carrier has a 20 MHz bandwidth.
Description
CROSS-REFERENCE TO PROVISIONAL APPLICATION
[0001] This application claims the benefit of U.S. Provisional
Application No. 61047,294, filed by Eke N. Onggosanusi, Anand G.
Dabak, Badri Varadarajan, Runhua Chen and Tank Muharemovic on Apr.
23, 2008, entitled "Backward Compatible Bandwidth Extension"
commonly assigned with this application and incorporated herein by
reference.
[0002] This application also claims the benefit of U.S. Provisional
Application No. 61/048,698, filed by Eko N, Onggosanusi, Anand G.
Dabak, Badri Varadarajan, Runhua Chen and Tank Muharemovic on Apr.
29, 2008, entitled "Backward Compatible Bandwidth Extension"
commonly assigned with this application and incorporated herein by
reference.
TECHNICAL FIELD
[0003] The present disclosure is directed, in general, to a
communication system and, more specifically, to a transmitter, a
receiver and methods of operating a transmitter and a receiver.
BACKGROUND
[0004] In a cellular network, such as one employing orthogonal
frequency division multiple access (OFDMA), each cell employs a
base station that communicates with user equipment, such as a cell
phone or a laptop that is actively located within its cell. MIMO
communication systems offer large increases in throughput due to
their ability to support multiple parallel data streams that are
each transmitted from different antennas. These systems provide
increased data rates and reliability by exploiting a spatial
multiplexing gain or spatial diversity gain that is available in
MIMO channels. Although transmission bandwidths are currently
adequate, improvements in this area would be beneficial in the
art.
SUMMARY
[0005] Embodiments of the present disclosure provide a transmitter,
a receiver and methods of operating a transmitter and a receiver.
In one embodiment, the transmitter includes a bandwidth
configuration unit configured to provide an increased system
bandwidth corresponding to a bandwidth extension over multiple
component carriers. Additionally, the transmitter also includes a
transmit unit configured to employ the bandwidth extension.
[0006] In another embodiment, the receiver includes a receive unit
configured to receive a transmission having an increased system
bandwidth. The receiver also includes a bandwidth adaptation unit
configured to apply the increased system bandwidth corresponding to
a bandwidth extension over multiple component carriers.
[0007] In another aspect, the method of operating a transmitter
includes providing an increased system bandwidth corresponding to a
bandwidth extension over multiple component carriers and
transmitting in accordance to the bandwidth extension.
[0008] In yet another aspect, the method of operating a receiver
includes receiving a transmission having an increased system
bandwidth and applying the increased system bandwidth corresponding
to a bandwidth extension over multiple component carriers.
[0009] The foregoing has outlined preferred and alternative
features of the present disclosure so that those skilled in the art
may better understand the detailed description of the disclosure
that follows. Additional features of the disclosure will be
described hereinafter that form the subject of the claims of the
disclosure. Those skilled in the art will appreciate that they can
readily use the disclosed conception and specific embodiment as a
basis for designing or modifying other structures for carrying out
the same purposes of the present disclosure,
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] For a more complete understanding of the present disclosure,
reference is now made to the following descriptions taken in
conjunction with the accompanying drawings, in which
[0011] FIG. 1 illustrates an exemplary diagram of an embodiment of
a cellular network constructed according to the principles of the
present disclosure;
[0012] FIGS. 2A and 2B illustrate examples of multi-carrier
bandwidth extensions of an increased system bandwidth as may be
employed by a transmitter and receiver such as the NodeB
transmitter and UE receiver of FIG. 1;
[0013] FIGS. 3A and 3B illustrate examples of common control
information to support multi-carrier bandwidth extension;
[0014] FIGS. 4A and 4B illustrate examples of a transmission of
dedicated control information to support multi-carrier bandwidth
extensions;
[0015] FIGS. 5A and 5B illustrate examples associated with a
multi-carrier bandwidth extension that may be employed for sounding
reference signal (SRS);
[0016] FIG. 6 illustrates a flow diagram of a method of operating a
transmitter that is carried out according to the principles of the
present disclosure; and
[0017] FIG. 7 illustrates a flow diagram of a method of operating a
receiver that is carried out according to the principles of the
present disclosure.
DETAILED DESCRIPTION
[0018] FIG. 1 illustrates an exemplary diagram of an embodiment of
a cellular network 100 constructed according to the principles of
the present disclosure. The cellular network 100 is part of an
OFDMA system and includes a cellular grid having a centric cell and
six surrounding first-tier cells. The centric cell employs a
centric base station (NodeB), as shown.
[0019] The NodeB includes a base station transmitter 105 having a
bandwidth configuration unit 106 and a transmit unit 107. The
cellular network 100 also includes user equipment (UE) operating
within the centric cell, wherein the NodeB acts as a serving base
station to the UE. The UE includes a UE receiver 110 having a
receive unit 111 and a bandwidth adaptation unit 112.
[0020] In the base station transmitter 105, the bandwidth
configuration unit 106 provides an increased system bandwidth for
the UE receiver 110 corresponding to a multi-carrier bandwidth
extension. In such extension, each of the carriers is termed a
component carrier. The transmit unit 107 employs the multi-carrier
bandwidth extension for transmitting to the UE receiver 110, in the
UE receiver 110, the receive unit 111 receives a transmission
having the increased system bandwidth from the base station
transmitter 105. The bandwidth adaptation unit 112 applies the
increased system bandwidth from the base station transmitter 105
corresponding to the multi-carrier bandwidth extension.
[0021] Peak data rate requirements for International Mobile
Telecommunication-Advanced (IMT-A) can be fulfilled by a
multi-carrier extension of E-UTRA. A main issue is that a minimum
UE reception requirement is 20 MHz for backward compatibility,
Therefore, since some form of extension based on 20 MHz bandwidths
seems advantageous, examples presented below employ 20 MHz
bandwidths, although other bandwidths may be employed corresponding
to the principles of the present disclosure.
[0022] FIGS. 2A and 2B illustrate examples of multi-carrier
bandwidth extensions of an increased system bandwidth as may be
employed by a transmitter and receiver such as the NodeE
transmitter and UE receiver of FIG. 1. In FIG. 2A, an example is
shown of a multi-carrier bandwidth extension 200 that is a joint
extension. The joint extension of this example covers a continuous
100 MHz bandwidth and jointly aggregates multiple contiguous
component carriers into a single carrier of larger bandwidth. In
FIG. 2B, an example is shown of a multi-carrier bandwidth extension
250 that includes separate extensions. The separate extensions of
this example provide five contiguous component carriers of 20 MHz
for a total bandwidth extension of 100 MHz. Separate extensions may
also be applied for non-contiguous component carriers.
[0023] For a NodeB with higher system bandwidth, UEs with 20 MHz
minimum reception capability may be semi-statically allocated only
one 20 MHz component carrier. Additionally, examples supporting
both joint and separate extensions are provided for flexibility.
Table 1 contrasts various system aspects of joint and separate
extensions.
TABLE-US-00001 TABLE 1 System Aspects Joint Extension Separate
Extension (1) PAPR/CM for UL Lower Higher (2) Spectral Potential
increase No increase efficiency (frequency scheduling, avoids
"guard sub- carriers") (3) Required Signaling support Potential
extension in (CQI, DL control), interaction across specification
for RS definition, carriers higher bandwidth transport block
definition) (4) Accommodating a Less flexible More flexible.
minimum UE reception (Also allows non- requirement of 20 MHz
contiguous 20 MHz and LTE migration allocations)
[0024] A higher bandwidth extension requires the support of
intra-frequency measurements to aid neighboring cell search and
handover across different cells. Synchronization signals and
potentially PBCH) can be replicated on the edge of system bandwidth
is another example. A downlink common reference signal (DL CRS)
pattern may be repeated every 20 MHz within the system bandwidth.
Other examples of what may be repeated include frequency domain
patterns and RS sequences (pseudo-random binary sequences).
[0025] In any cellular communication systems, the transmission of
control information is an integral part of the system design,
Control information can be categorized into common control (a
broadcast that is common to all USe and typically cell-specific)
and dedicated control (a broadcast that is UE-specific) control
information. Examples of common control information include PCFICH
(physical control format indicator channel) that carries the length
or size of the control region in every subframe, DBCH (dynamic
broadcast channel) that carries a system information block (SIB)
and PDCCH (physical downlink control channel) that is a grant for
DBCH. Examples of dedicated control information include PDCCH DL/UL
grants, PHICH (physical hybrid ARQ indicator channel, which carries
the downlink ACK/NAK corresponding to an UL transmission) and PUCCH
(physical uplink control channel). Hence, the design of
multi-carrier bandwidth extension needs to incorporate the
mechanism for control information transmission.
[0026] FIGS. 3A and 3B illustrate examples 300 and 350 of common
control information to support multi-carrier bandwidth extension.
First and second schemes are shown in FIGS. 3A and 3B,
respectively. Table 2 contrasts various system aspects of two
alternatives.
TABLE-US-00002 TABLE 2 System Aspects Scheme 1 Scheme 2 (1)
Illustration One copy in a Replicate copies in (example for 100 MHz
predetermined 20 MHz every 20 MHz part system bandwidth) part
(e.g., first or last 20 MHz part, center) (2) Overhead Lower Higher
(3) UE complexity Need to retune 20 MHz No extra complexity.
bandpass filter to This may allow read common control simpler
parallel signals. This may processing. introduce additional
delay.
[0027] Scheme 2 may be preferred since PCFICH overhead is small,
and SIB is spread across 80 ms.
[0028] FIGS. 4A and 4B illustrate examples 400 and 450 of a
transmission of dedicated control information to support
multi-carrier bandwidth extensions. First and second schemes are
shown in FIGS. 4A and 4B, respectively. Bandwidth allocations for
specific UEs 405, 410, 415 and 420 are shown for a joint extension,
and bandwidth allocations for specific UEs 455, 460, 465 and 470
are shown for separate extensions. Table 3 contrasts various system
aspects of the two alternatives.
TABLE-US-00003 TABLE 3 System Aspects Scheme 1 Scheme 2 (1)
Illustration: Dedicated controls Dedicated controls example for 100
utilize the entire utilize only a 20 MHz MHz system BW UE reception
portion of the UE with 20 MHz, bandwidth reception bandwidth 40
MHz, 60 MHz, and 100 MHz UE reception BWs (2) Performance Higher
frequency Lower frequency diversity diversity (3) Flexibility More
compatible with separate (especially non-contiguous) allocation (4)
Multiplexing Multiplexing UEs Easier, more with different flexible
(20 MHz reception bandwidths portion is treated may be challenging
as control channel resource)
[0029] Scheme 2 may be preferred since frequency diversity beyond
20 MHz may not be beneficial for typical scenarios and it provides
simpler multiplexing, For UEs with reception bandwidth that is
greater than 20 MHz (or a multiple of 20 MHz), the 20 MHz portion
for dedicated control transmission may be semi-statically
configured by the NodeB (e.g., via dedicated RRC signaling),
Additionally, it may be predetermined via a fixed rule. For
example, as a function of the center frequency, UE reception
bandwidth, system bandwidth or UE identity (RNTI),
[0030] Possible variations include combinations of Scheme 1 and
Scheme 2. Some control channels may be transmitted with Scheme 1,
and some other control channels may be transmitted with Scheme 2.
For example; WHICH with Scheme 1 and PDCCH grants with Scheme 2.
Furthermore, it is also possible to apply schemes intended for
transmitting dedicated control for at least one of the common
(broadcast) control parameters.
[0031] FIGS. 5A and 5B illustrate examples associated with a
multi-carrier bandwidth extension, 500, 550 that may be employed
for sounding reference signal (SRS) on the uplink. This part of the
bandwidth extension actually applies to the uplink and downlink.
However, the particular example illustrated applies only to an
uplink sounding reference signal. Alternately, it may apply to any
type of reference signals and bandwidth extension. For example, it
may apply to an uplink demodulation reference signal and bandwidth
extension. Alternately, it may apply to a downlink demodulation
reference signal and bandwidth extension. It may apply to any
backward compatible system, which has multiple component carriers.
So essentially, with each component carrier a reference signal is
being transmitted.
[0032] FIG. 5A shows an extension for a 100 MHz UE wherein a
generated SRS sequence Z is repeated. This repetition is in the
frequency domain, and for M multiples of 20 MHz, it is repeated M
times. This approach may create a potential issue with PAPR, for
example 100 MHz. FIG. 5B shows an example of how the reference
signal Z for a 20 MHz UE reception bandwidth may be generated. A
sequence 555 can be a Zadoff-Chu sequence or a pseudorandom CAZAC
sequence, for example. A phase ramp 560 in the frequency domain
corresponds to a cyclic shift in the time domain. The phase ramp
560 does not have to be the same for each reference signal Z.
However, the sequence Z is the same.
[0033] FIG. 6 illustrates a flow diagram of a method 600 of
operating a transmitter that is carried out according to the
principles of the present disclosure. The method 600 starts in a
step 605 and a transmitter is provided in a step 610. Then, in a
step 615, an increased system bandwidth for a receiver is provided
corresponding to a bandwidth extension over multiple component
carriers. The bandwidth extension is employed in transmitting to
the receiver, in a step 620.
[0034] In one embodiment, the bandwidth extension jointly
aggregates multiple contiguous component carriers into a single
carrier of larger bandwidth. In another embodiment, the bandwidth
extension constitutes multiple separate contiguous or
non-contiguous component carriers. In yet another embodiment, the
bandwidth extension includes common control information that
occupies only one component carrier or is replicated in all
component carriers. In still another embodiment, the bandwidth
extension includes dedicated control information that occupies at
least one component carrier. In a further embodiment, the bandwidth
extension corresponds to a sounding reference signal that is
replicated in a portion of the multiple component carriers. The
method 600 ends in a step 625.
[0035] FIG. 7 illustrates a flow diagram of a method 700 of
operating a receiver that is carried out according to the
principles of the present disclosure. The method 700 starts in a
step 705 and a receiver is provided in a step 710. Then, in a step
715, a transmission having an increased system bandwidth is
received from a transmitter. The increased system bandwidth from
the transmitter is applied corresponding to a bandwidth extension
over multiple component carriers, in a step 720.
[0036] In one embodiment, the bandwidth extension jointly
aggregates multiple contiguous component carriers into a single
carrier of larger bandwidth. In another embodiment, the bandwidth
extension constitutes multiple separate contiguous or
non-contiguous component carriers. In yet another embodiment, the
bandwidth extension includes common control information that
occupies only one component carrier or is replicated in all
component carriers. In still another embodiment, the bandwidth
extension includes dedicated control information that occupies at
least one component carrier. In a further embodiment, the bandwidth
extension corresponds to a sounding reference signal that is
replicated in a portion of the multiple component carriers. The
method 700 ends in a step 725.
[0037] While the methods disclosed herein have been described and
shown with reference to particular steps performed in a particular
order, it will be understood that these steps may be combined,
subdivided, or reordered to form an equivalent method without
departing from the teachings of the present disclosure Accordingly,
unless specifically indicated herein, the order or the grouping of
the steps is not a limitation of the present disclosure.
[0038] Those skilled in the art to which the disclosure relates
will appreciate that other and further additions, deletions,
substitutions and modifications may be made to the described
example embodiments without departing from the disclosure.
* * * * *